Cortesi, S; Cagnotti, M; Bianda, M; Ramelli, R; Manna, A Sunspot Observations and Counting at Specola Solare Ticinese in Locarno Since 1957 Journal Article In: Solar Physics, 2016. @article{2016SoPh..tmp...44C, title = {Sunspot Observations and Counting at Specola Solare Ticinese in Locarno Since 1957}, author = {Cortesi, S. and Cagnotti, M. and Bianda, M. and Ramelli, R. and Manna, A.}, url = {http://adsabs.harvard.edu/abs/2016SoPh..tmp...44C}, doi = {10.1007/s11207-016-0872-7}, year = {2016}, date = {2016-01-01}, journal = {Solar Physics}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Steiner, O; Züger, F; Belluzzi, L Polarized radiative transfer in discontinuous media Journal Article In: Astronomy and Astrophysics, 586 , pp. A42, 2016. @article{2016A&A...586A..42S, title = {Polarized radiative transfer in discontinuous media}, author = {Steiner, O. and Züger, F. and Belluzzi, L.}, url = {http://adsabs.harvard.edu/abs/2016SoPh..tmp...44C}, doi = {10.1051/0004-6361/201527158}, year = {2016}, date = {2016-01-01}, journal = {Astronomy and Astrophysics}, volume = {586}, pages = {A42}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Privitera, G; Meynet, G; Eggenberger, P; Vidotto, A A; Villaver, E; Bianda, M Star-planet interactions. I. Stellar rotation and planetary orbits Journal Article In: Astronomy and Astrophysics, 591 , pp. A45, 2016. @article{2016A&A...591A..45P, title = {Star-planet interactions. I. Stellar rotation and planetary orbits}, author = {Privitera, G. and Meynet, G. and Eggenberger, P. and Vidotto, A.A. and Villaver, E. and Bianda, M.}, url = {http://adsabs.harvard.edu/abs/2016A%26A...591A..45P}, doi = {10.1051/0004-6361/201528044}, year = {2016}, date = {2016-01-01}, journal = {Astronomy and Astrophysics}, volume = {591}, pages = {A45}, abstract = {Context. As a star evolves, planet orbits change over time owing to tidal interactions, stellar mass losses, friction and gravitational drag forces, mass accretion, and evaporation on/by the planet. Stellar rotation modifies the structure of the star and therefore the way these different processes occur. Changes in orbits, subsequently, have an impact on the rotation of the star. Aims: Models that account in a consistent way for these interactions between the orbital evolution of the planet and the evolution of the rotation of the star are still missing. The present work is a first attempt to fill this gap. Methods: We compute the evolution of stellar models including a comprehensive treatment of rotational effects, together with the evolution of planetary orbits, so that the exchanges of angular momentum between the star and the planetary orbit are treated in a self-consistent way. The evolution of the rotation of the star accounts for the angular momentum exchange with the planet and also follows the effects of the internal transport of angular momentum and chemicals. These rotating models are computed for initial masses of the host star between 1.5 and 2.5 M$_⊙$, with initial surface angular velocities equal to 10 and 50% of the critical velocity on the zero age main sequence (ZAMS), for a metallicity Z = 0.02, with and without tidal interactions with a planet. We consider planets with masses between 1 and 15 Jupiter masses (M$_J$), which are beginning their evolution at various distances between 0.35 and 4.5 au. Results: We demonstrate that rotating stellar models without tidal interactions and without any wind magnetic braking during the red giant phase can well reproduce the surface rotations of the bulk of red giants. However, models without any interactions cannot account for fast rotating red giants in the upper part of the red giant branch, where these models, whatever the initial rotation considered on the ZAMS, always predict very low velocities. For these stars, some interaction with a companion is highly probable and the present rotating stellar models with planets confirm that tidal interaction can reproduce their high surface velocities. We also show that the minimum distance between the planet and the star on the ZAMS, which enables the planet to avoid engulfment and survive (i.e. the survival limit) is decreased around faster rotating stars.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Context. As a star evolves, planet orbits change over time owing to tidal interactions, stellar mass losses, friction and gravitational drag forces, mass accretion, and evaporation on/by the planet. Stellar rotation modifies the structure of the star and therefore the way these different processes occur. Changes in orbits, subsequently, have an impact on the rotation of the star. <BR /> Aims: Models that account in a consistent way for these interactions between the orbital evolution of the planet and the evolution of the rotation of the star are still missing. The present work is a first attempt to fill this gap. <BR /> Methods: We compute the evolution of stellar models including a comprehensive treatment of rotational effects, together with the evolution of planetary orbits, so that the exchanges of angular momentum between the star and the planetary orbit are treated in a self-consistent way. The evolution of the rotation of the star accounts for the angular momentum exchange with the planet and also follows the effects of the internal transport of angular momentum and chemicals. These rotating models are computed for initial masses of the host star between 1.5 and 2.5 M$_⊙$, with initial surface angular velocities equal to 10 and 50% of the critical velocity on the zero age main sequence (ZAMS), for a metallicity Z = 0.02, with and without tidal interactions with a planet. We consider planets with masses between 1 and 15 Jupiter masses (M$_J$), which are beginning their evolution at various distances between 0.35 and 4.5 au. <BR /> Results: We demonstrate that rotating stellar models without tidal interactions and without any wind magnetic braking during the red giant phase can well reproduce the surface rotations of the bulk of red giants. However, models without any interactions cannot account for fast rotating red giants in the upper part of the red giant branch, where these models, whatever the initial rotation considered on the ZAMS, always predict very low velocities. For these stars, some interaction with a companion is highly probable and the present rotating stellar models with planets confirm that tidal interaction can reproduce their high surface velocities. We also show that the minimum distance between the planet and the star on the ZAMS, which enables the planet to avoid engulfment and survive (i.e. the survival limit) is decreased around faster rotating stars. |
Privitera, G; Meynet, G; Eggenberger, P; Vidotto, A A; Villaver, E; Bianda, M Star-planet interactions. II. Is planet engulfment the origin of fast rotating red giants? Journal Article In: Astronomy and Astrophysics, 593 , pp. A128, 2016. @article{2016A&A...593A.128P, title = {Star-planet interactions. II. Is planet engulfment the origin of fast rotating red giants?}, author = {Privitera, G. and Meynet, G. and Eggenberger, P. and Vidotto, A.A. and Villaver, E. and Bianda, M.}, doi = {10.1051/0004-6361/201628758}, year = {2016}, date = {2016-01-01}, journal = {Astronomy and Astrophysics}, volume = {593}, pages = {A128}, abstract = {Context. Fast rotating red giants in the upper part of the red giant branch have surface velocities that cannot be explained by single star evolution. Aims: We check whether tides between a star and a planet followed by planet engulfment can indeed accelerate the surface rotation of red giants for a sufficiently long time to produce these fast rotating red giants. Methods: We studied how the surface rotation velocity at the stellar surface evolves using rotating stellar models, accounting for the redistribution of the angular momentum inside the star by different transport mechanisms, the exchanges of angular momentum between the planet orbit and the star before the engulfment, and for the deposition of angular momentum inside the star at the engulfment. We considered different situations with masses of stars in the range between 1.5 and 2.5 M$_⊙$, masses of the planets between 1 and 15 M$_J$ (Jupiter mass), and initial semimajor axis between 0.5 and 1.5 au. The metallicity Z for our stellar models is 0.02. Results: We show that the surface velocities reached at the end of the orbital decay due to tidal forces and planet engulfment can be similar to values observed for fast rotating red giants. This surface velocity then decreases when the star evolves along the red giant branch but at a sufficiently slow pace to allowing stars to be detected with such a high velocity. More quantitatively, star-planet interaction can produce a rapid acceleration of the surface of the star, above values equal to 8 km s$^-1$, for periods lasting up to more than 30% the red giant branch phase. As found already by previous works, the changes of the surface carbon isotopic ratios produced by the dilution of the planetary material into the convective envelope is modest. The increase of the lithium abundance due to this effect might be much more important, however lithium may be affected by many different, still uncertain, processes. Thus any lithium measurement can hardly be taken as a support or argument against any star-planet interaction. Conclusions: The acceleration of the stellar surface to rotation velocities above limits that depend on the surface gravity does appear at the moment to be the clearest signature of a star-planet interaction.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Context. Fast rotating red giants in the upper part of the red giant branch have surface velocities that cannot be explained by single star evolution. <BR /> Aims: We check whether tides between a star and a planet followed by planet engulfment can indeed accelerate the surface rotation of red giants for a sufficiently long time to produce these fast rotating red giants. <BR /> Methods: We studied how the surface rotation velocity at the stellar surface evolves using rotating stellar models, accounting for the redistribution of the angular momentum inside the star by different transport mechanisms, the exchanges of angular momentum between the planet orbit and the star before the engulfment, and for the deposition of angular momentum inside the star at the engulfment. We considered different situations with masses of stars in the range between 1.5 and 2.5 M$_⊙$, masses of the planets between 1 and 15 M$_J$ (Jupiter mass), and initial semimajor axis between 0.5 and 1.5 au. The metallicity Z for our stellar models is 0.02. <BR /> Results: We show that the surface velocities reached at the end of the orbital decay due to tidal forces and planet engulfment can be similar to values observed for fast rotating red giants. This surface velocity then decreases when the star evolves along the red giant branch but at a sufficiently slow pace to allowing stars to be detected with such a high velocity. More quantitatively, star-planet interaction can produce a rapid acceleration of the surface of the star, above values equal to 8 km s$^-1$, for periods lasting up to more than 30% the red giant branch phase. As found already by previous works, the changes of the surface carbon isotopic ratios produced by the dilution of the planetary material into the convective envelope is modest. The increase of the lithium abundance due to this effect might be much more important, however lithium may be affected by many different, still uncertain, processes. Thus any lithium measurement can hardly be taken as a support or argument against any star-planet interaction. <BR /> Conclusions: The acceleration of the stellar surface to rotation velocities above limits that depend on the surface gravity does appear at the moment to be the clearest signature of a star-planet interaction. |
Privitera, G; Meynet, G; Eggenberger, P; Georgy, C; Ekström, S; Vidotto, A A; Bianda, M; Villaver, E; ud-Doula , A High surface magnetic field in red giants as a new signature of planet engulfment? Journal Article In: Astronomy and Astrophysics, 593 , pp. L15, 2016. @article{2016A&A...593L..15P, title = {High surface magnetic field in red giants as a new signature of planet engulfment?}, author = {Privitera, G. and Meynet, G. and Eggenberger, P. and Georgy, C. and Ekström, S. and Vidotto, A.A. and Bianda, M. and Villaver, E. and ud-Doula, A.}, doi = {10.1051/0004-6361/201629142}, year = {2016}, date = {2016-01-01}, journal = {Astronomy and Astrophysics}, volume = {593}, pages = {L15}, abstract = {Context. Red giant stars may engulf planets. This may increase the rotation rate of their convective envelope, which could lead to strong dynamo-triggered magnetic fields. Aims: We explore the possibility of generating magnetic fields in red giants that have gone through the process of a planet engulfment. We compare them with similar models that evolve without any planets. We discuss the impact of magnetic braking through stellar wind on the evolution of the surface velocity of the parent star. Methods: By studying rotating stellar models with and without planets and an empirical relation between the Rossby number and the surface magnetic field, we deduced the evolution of the surface magnetic field along the red giant branch. The effects of stellar wind magnetic braking were explored using a relation deduced from magnetohydrodynamics simulations. Results: The stellar evolution model of a red giant with 1.7 M$_⊙$ without planet engulfment and with a time-averaged rotation velocity during the main sequence equal to 100 km s$^-1$ shows a surface magnetic field triggered by convection that is stronger than 10 G only at the base of the red giant branch, that is, for gravities log g$gt$ 3. When a planet engulfment occurs, this magnetic field can also appear at much lower gravities, that is, at much higher luminosities along the red giant branch. The engulfment of a 15 M$_J$ planet typically produces a dynamo-triggered magnetic field stronger than 10 G for gravities between 2.5 and 1.9. We show that for reasonable magnetic braking laws for the wind, the high surface velocity reached after a planet engulfment may be maintained sufficiently long to be observable. Conclusions: High surface magnetic fields for red giants in the upper part of the red giant branch are a strong indication of a planet engulfment or of an interaction with a companion. Our theory can be tested by observing fast-rotating red giants such as HD 31994, Tyc 0347-00762-1, Tyc 5904-00513-1, and Tyc 6054-01204-1 and by determining whether they show magnetic fields.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Context. Red giant stars may engulf planets. This may increase the rotation rate of their convective envelope, which could lead to strong dynamo-triggered magnetic fields. <BR /> Aims: We explore the possibility of generating magnetic fields in red giants that have gone through the process of a planet engulfment. We compare them with similar models that evolve without any planets. We discuss the impact of magnetic braking through stellar wind on the evolution of the surface velocity of the parent star. <BR /> Methods: By studying rotating stellar models with and without planets and an empirical relation between the Rossby number and the surface magnetic field, we deduced the evolution of the surface magnetic field along the red giant branch. The effects of stellar wind magnetic braking were explored using a relation deduced from magnetohydrodynamics simulations. <BR /> Results: The stellar evolution model of a red giant with 1.7 M$_⊙$ without planet engulfment and with a time-averaged rotation velocity during the main sequence equal to 100 km s$^-1$ shows a surface magnetic field triggered by convection that is stronger than 10 G only at the base of the red giant branch, that is, for gravities log g$gt$ 3. When a planet engulfment occurs, this magnetic field can also appear at much lower gravities, that is, at much higher luminosities along the red giant branch. The engulfment of a 15 M$_J$ planet typically produces a dynamo-triggered magnetic field stronger than 10 G for gravities between 2.5 and 1.9. We show that for reasonable magnetic braking laws for the wind, the high surface velocity reached after a planet engulfment may be maintained sufficiently long to be observable. <BR /> Conclusions: High surface magnetic fields for red giants in the upper part of the red giant branch are a strong indication of a planet engulfment or of an interaction with a companion. Our theory can be tested by observing fast-rotating red giants such as HD 31994, Tyc 0347-00762-1, Tyc 5904-00513-1, and Tyc 6054-01204-1 and by determining whether they show magnetic fields. |
Steiner, O Why numerical simulations? Conference General Assembly of the Swiss Society of Astronomy and Astrophysics, Locarno, 2015. @conference{Steiner2015, title = {Why numerical simulations?}, author = {Steiner, O.}, url = {http://data.irsol.ch/Talks/sgaa_talk_steiner.pdf}, year = {2015}, date = {2015-10-16}, address = {General Assembly of the Swiss Society of Astronomy and Astrophysics, Locarno}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Tremblay, P -E; Fontaine, G; Freytag, B; Steiner, O; Ludwig, H -G; Steffen, M; Wedemeyer, S; Brassard, P On the Evolution of Magnetic White Dwarfs Journal Article In: Astrophysical Journal, 812 , pp. 19, 2015. @article{2015ApJ...812...19T, title = {On the Evolution of Magnetic White Dwarfs}, author = {Tremblay, P.-E. and Fontaine, G. and Freytag, B. and Steiner, O. and Ludwig, H.-G. and Steffen, M. and Wedemeyer, S. and Brassard, P.}, url = {http://adsabs.harvard.edu/abs/2015ApJ...812...19T}, doi = {10.1088/0004-637X/812/1/19}, year = {2015}, date = {2015-10-01}, journal = {Astrophysical Journal}, volume = {812}, pages = {19}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O Physics of Polarized Scattering at Multi-level Atomic Systems Journal Article In: Astrophysical Journal, 801 , pp. 70, 2015. @article{2015ApJ...801...70S, title = {Physics of Polarized Scattering at Multi-level Atomic Systems}, author = {Stenflo, J.O.}, url = {http://adsabs.harvard.edu/abs/2015ApJ...801...70S}, doi = {10.1088/0004-637X/801/1/70}, year = {2015}, date = {2015-03-01}, journal = {Astrophysical Journal}, volume = {801}, pages = {70}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Carlin, E S; Asensio Ramos, A Chromospheric Diagnosis with Ca II Lines: Forward Modeling in Forward Scattering. I Journal Article In: Astrophysical Journal, 801 , pp. 16, 2015. @article{2015ApJ...801...16C, title = {Chromospheric Diagnosis with Ca II Lines: Forward Modeling in Forward Scattering. I}, author = {Carlin, E.S. and Asensio Ramos, A.}, url = {http://adsabs.harvard.edu/abs/2015ApJ...801...16C}, doi = {10.1088/0004-637X/801/1/16}, year = {2015}, date = {2015-03-01}, journal = {Astrophysical Journal}, volume = {801}, pages = {16}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Belluzzi, L; Trujillo Bueno, J; Landi Degl'Innocenti, E Radiative Transfer Modeling of the Enigmatic Scattering Polarization in the Solar Na I D1 Line Journal Article In: Astrophysical Journal, 814 , pp. 116, 2015. @article{2015ApJ...814..116B, title = {Radiative Transfer Modeling of the Enigmatic Scattering Polarization in the Solar Na I D1 Line}, author = {Belluzzi, L. and Trujillo Bueno, J. and Landi Degl'Innocenti, E.}, url = {http://adsabs.harvard.edu/abs/2015ApJ...814..116B}, doi = {10.1088/0004-637X/814/2/116}, year = {2015}, date = {2015-01-01}, journal = {Astrophysical Journal}, volume = {814}, pages = {116}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Belluzzi, L; Landi Degl'Innocenti, E; Trujillo Bueno, J Isotropic Inelastic Collisions in a Multiterm Atom with Hyperfine Structure Journal Article In: Astrophysical Journal, 812 , pp. 73, 2015. @article{2015ApJ...812...73B, title = {Isotropic Inelastic Collisions in a Multiterm Atom with Hyperfine Structure}, author = {Belluzzi, L. and Landi Degl'Innocenti, E. and Trujillo Bueno, J.}, url = {http://adsabs.harvard.edu/abs/2015ApJ...812...73B}, doi = {10.1088/0004-637X/812/1/73}, year = {2015}, date = {2015-01-01}, journal = {Astrophysical Journal}, volume = {812}, pages = {73}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O History of Solar Magnetic Fields Since George Ellery Hale Journal Article In: Space Science Reviews, 2015. @article{2015SSRv..tmp...83S, title = {History of Solar Magnetic Fields Since George Ellery Hale}, author = {Stenflo, J.O.}, url = {http://adsabs.harvard.edu/abs/2015SSRv..tmp...83S}, doi = {10.1007/s11214-015-0198-z}, year = {2015}, date = {2015-01-01}, journal = {Space Science Reviews}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O FTS atlas of the Sun's spectrally resolved center-to-limb variation Journal Article In: Astronomy and Astrophysics, 573 , pp. A74, 2015. @article{2015A&A...573A..74S, title = {FTS atlas of the Sun's spectrally resolved center-to-limb variation}, author = {Stenflo, J.O.}, url = {http://data.irsol.ch/Papers/AA573_A74_2015.pdf}, doi = {10.1051/0004-6361/201424685}, year = {2015}, date = {2015-01-01}, journal = {Astronomy and Astrophysics}, volume = {573}, pages = {A74}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Steiner, O; Salhab, R; Freytag, B; Rajaguru, P; Schaffenberger, W; Steffen, M Properties of small-scale magnetism of stellar atmospheres Journal Article In: Publications of the ASJ, 66 , pp. S5, 2014. @article{2014PASJ...66S...5S, title = {Properties of small-scale magnetism of stellar atmospheres}, author = {Steiner, O. and Salhab, R. and Freytag, B. and Rajaguru, P. and Schaffenberger, W. and Steffen, M.}, url = {http://adsabs.harvard.edu/abs/2014PASJ...66S...5S}, doi = {10.1093/pasj/psu083}, year = {2014}, date = {2014-12-01}, journal = {Publications of the ASJ}, volume = {66}, pages = {S5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Sowmya, K; Nagendra, K N; Sampoorna, M; Stenflo, J O Polarized Light Scattering with the Paschen-Back Effect, Level-crossing of Fine Structure States, and Partial Frequency Redistribution Journal Article In: Astrophysical Journal, 793 , pp. 71, 2014. @article{2014ApJ...793...71S, title = {Polarized Light Scattering with the Paschen-Back Effect, Level-crossing of Fine Structure States, and Partial Frequency Redistribution}, author = {Sowmya, K. and Nagendra, K.N. and Sampoorna, M. and Stenflo, J.O.}, url = {http://adsabs.harvard.edu/abs/2014ApJ...793...71S}, doi = {10.1088/0004-637X/793/2/71}, year = {2014}, date = {2014-10-01}, journal = {Astrophysical Journal}, volume = {793}, pages = {71}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Supriya, H D; Smitha, H N; Nagendra, K N; Stenflo, J O; Bianda, M; Ramelli, R; Ravindra, B; Anusha, L S Center-to-limb Observations and Modeling of the Ca I 4227 Å line Journal Article In: Astrophysical Journal, 793 , pp. 42, 2014. @article{2014ApJ...793...42S, title = {Center-to-limb Observations and Modeling of the Ca I 4227 Å line}, author = {Supriya, H.D. and Smitha, H.N. and Nagendra, K.N. and Stenflo, J.O. and Bianda, M. and Ramelli, R. and Ravindra, B. and Anusha, L.S.}, url = {http://data.irsol.ch/Papers/CaI_clv-final-submitted.pdf}, doi = {10.1088/0004-637X/793/1/42}, year = {2014}, date = {2014-09-01}, journal = {Astrophysical Journal}, volume = {793}, pages = {42}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ishikawa, R; Asensio Ramos, A; Belluzzi, L; Manso Sainz, R; Stepan, J; Trujillo Bueno, J; Goto, M; Tsuneta, S On the Inversion of the Scattering Polarization and the Hanle Effect Signals in the Hydrogen Ly-alpha Line Journal Article In: Astrophysical Journal, 787 , pp. 159, 2014. @article{2014ApJ...787..159I, title = {On the Inversion of the Scattering Polarization and the Hanle Effect Signals in the Hydrogen Ly-alpha Line}, author = {Ishikawa, R. and Asensio Ramos, A. and Belluzzi, L. and Manso Sainz, R. and Stepan, J. and Trujillo Bueno, J. and Goto, M. and Tsuneta, S.}, url = {http://arxiv.org/pdf/1404.0786v1}, doi = {10.1088/0004-637X/787/2/159}, year = {2014}, date = {2014-01-01}, journal = {Astrophysical Journal}, volume = {787}, pages = {159}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Sowmya, K; Nagendra, K N; Stenflo, J O; Sampoorna, M Polarized Scattering with Paschen-Back Effect, Hyperfine Structure, and Partial Frequency Redistribution in Magnetized Stellar Atmospheres Journal Article In: Astrophysical Journal, 786 , pp. 150, 2014. @article{2014ApJ...786..150S, title = {Polarized Scattering with Paschen-Back Effect, Hyperfine Structure, and Partial Frequency Redistribution in Magnetized Stellar Atmospheres}, author = {Sowmya, K. and Nagendra, K.N. and Stenflo, J.O. and Sampoorna, M.}, url = {http://adsabs.harvard.edu/abs/2014ApJ...793...71S}, doi = {10.1088/0004-637X/786/2/150}, year = {2014}, date = {2014-01-01}, journal = {Astrophysical Journal}, volume = {786}, pages = {150}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Smitha, H N; Nagendra, K N; Stenflo, J O; Bianda, M; Ramelli, R The Quantum Interference Effects in the Sc II 4247 Å Line of the Second Solar Spectrum Journal Article In: Astrophysical Journal, 794 (1), pp. 30, 2014. @article{0004-637X-794-1-30, title = {The Quantum Interference Effects in the Sc II 4247 Å Line of the Second Solar Spectrum}, author = {Smitha, H.N. and Nagendra, K.N. and Stenflo, J.O. and Bianda, M. and Ramelli, R.}, url = {http://stacks.iop.org/0004-637X/794/i=1/a=30}, year = {2014}, date = {2014-01-01}, journal = {Astrophysical Journal}, volume = {794}, number = {1}, pages = {30}, abstract = {The Sc II 4247 Å line formed in the chromosphere is one of the lines well known, like the Na I D 2 and Ba II D 2 , for its prominent triple-peak structure in Q / I and the underlying quantum interference effects governing it. In this paper, we try to study the nature of this triple-peak structure using the theory of F -state interference including the effects of partial frequency redistribution (PRD) and radiative transfer (RT). We compare our results with the observations taken in a quiet region near the solar limb. In spite of accounting for PRD and RT effects, it has not been possible to reproduce the observed triple-peak structure in Q / I . While the two wing PRD peaks (on either side of central peak) and the near wing continuum can be reproduced, the central peak is completely suppressed by the enhanced depolarization resulting from the hyperfine structure splitting. This suppression remains for all the tested widely different one-dimensional model atmospheres or for any multi-component combinations of them. While multidimensional RT effects may improve the fit to the intensity profiles, they do not appear capable of explaining the enigmatic central Q / I peak. This leads us to suspect that some aspect of quantum physics is missing.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The Sc II 4247 Å line formed in the chromosphere is one of the lines well known, like the Na I D 2 and Ba II D 2 , for its prominent triple-peak structure in Q / I and the underlying quantum interference effects governing it. In this paper, we try to study the nature of this triple-peak structure using the theory of F -state interference including the effects of partial frequency redistribution (PRD) and radiative transfer (RT). We compare our results with the observations taken in a quiet region near the solar limb. In spite of accounting for PRD and RT effects, it has not been possible to reproduce the observed triple-peak structure in Q / I . While the two wing PRD peaks (on either side of central peak) and the near wing continuum can be reproduced, the central peak is completely suppressed by the enhanced depolarization resulting from the hyperfine structure splitting. This suppression remains for all the tested widely different one-dimensional model atmospheres or for any multi-component combinations of them. While multidimensional RT effects may improve the fit to the intensity profiles, they do not appear capable of explaining the enigmatic central Q / I peak. This leads us to suspect that some aspect of quantum physics is missing. |
Stenflo, J O Solar magnetic fields as revealed by Stokes polarimetry Journal Article In: Astronomy and Astrophysics Reviews, 21 , pp. 66, 2013. @article{2013A&ARv..21...66S, title = {Solar magnetic fields as revealed by Stokes polarimetry}, author = {Stenflo, J.O.}, url = {http://adsabs.harvard.edu/abs/2013A%26ARv..21...66S}, doi = {10.1007/s00159-013-0066-3}, year = {2013}, date = {2013-09-01}, journal = {Astronomy and Astrophysics Reviews}, volume = {21}, pages = {66}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Sampoorna, M; Nagendra, K N; Stenflo, J O Line-interlocking Effects on Polarization in Spectral Lines by Rayleigh and Raman Scattering Journal Article In: Astrophysical Journal, 770 , pp. 92, 2013. @article{2013ApJ...770...92S, title = {Line-interlocking Effects on Polarization in Spectral Lines by Rayleigh and Raman Scattering}, author = {Sampoorna, M. and Nagendra, K.N. and Stenflo, J.O.}, url = {http://adsabs.harvard.edu/abs/2013ApJ...770...92S}, doi = {10.1088/0004-637X/770/2/92}, year = {2013}, date = {2013-06-01}, journal = {Astrophysical Journal}, volume = {770}, pages = {92}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Smitha, H N; Nagendra, K N; Stenflo, J O; Sampoorna, M Modeling the Quantum Interference Signatures of the Ba II D2 4554 Å Line in the Second Solar Spectrum Journal Article In: Astrophysical Journal, 768 , pp. 163, 2013. @article{2013ApJ...768..163S, title = {Modeling the Quantum Interference Signatures of the Ba II D2 4554 Å Line in the Second Solar Spectrum}, author = {Smitha, H.N. and Nagendra, K.N. and Stenflo, J.O. and Sampoorna, M.}, url = {http://adsabs.harvard.edu/abs/2013ApJ...768..163S}, doi = {10.1088/0004-637X/768/2/163}, year = {2013}, date = {2013-05-01}, journal = {Astrophysical Journal}, volume = {768}, pages = {163}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O; Demidov, M L; Bianda, M; Ramelli, R Calibration of the 6302/6301 Stokes V line ratio in terms of the 5250/5247 ratio Journal Article In: Astronomy and Astrophysics, 556 , pp. A113, 2013. @article{2013A&A...556A.113S, title = {Calibration of the 6302/6301 Stokes V line ratio in terms of the 5250/5247 ratio}, author = {Stenflo, J.O. and Demidov, M.L. and Bianda, M. and Ramelli, R.}, url = {http://data.irsol.ch/Papers/AA556_A113_2013.pdf}, doi = {10.1051/0004-6361/201321749}, year = {2013}, date = {2013-01-01}, journal = {Astronomy and Astrophysics}, volume = {556}, pages = {A113}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O Horizontal or vertical magnetic fields on the quiet Sun. Angular distributions and their height variations Journal Article In: Astronomy and Astrophysics, 555 , pp. A132, 2013. @article{2013A&A...555A.132S, title = {Horizontal or vertical magnetic fields on the quiet Sun. Angular distributions and their height variations}, author = {Stenflo, J.O.}, url = {http://adsabs.harvard.edu/abs/2013A%26A...555A.132S}, doi = {10.1051/0004-6361/201321608}, year = {2013}, date = {2013-01-01}, journal = {Astronomy and Astrophysics}, volume = {555}, pages = {A132}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ramelli, R; Stellmacher, G; Wiehr, E; Bianda, M Helium Emissions Observed in Ground-Based Spectra of Solar Prominences Journal Article In: Solar Physics, 281 , pp. 697-706, 2012. @article{2012SoPh..281..697R, title = {Helium Emissions Observed in Ground-Based Spectra of Solar Prominences}, author = {Ramelli, R. and Stellmacher, G. and Wiehr, E. and Bianda, M.}, url = {http://www.springerlink.com/content/y176797417028056/}, doi = {10.1007/s11207-012-0118-2}, year = {2012}, date = {2012-12-01}, journal = {Solar Physics}, volume = {281}, pages = {697-706}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Smitha, H N; Nagendra, K N; Stenflo, J O; Bianda, M; Sampoorna, M; Ramelli, R; Anusha, L S J-state interference signatures in the second solar spectrum. Modeling the Cr i triplet at 5204-5208 Å Journal Article In: Astronomy and Astrophysics, 541 , pp. A24, 2012. @article{2012A&A...541A..24S, title = {J-state interference signatures in the second solar spectrum. Modeling the Cr i triplet at 5204-5208 Å}, author = {Smitha, H.N. and Nagendra, K.N. and Stenflo, J.O. and Bianda, M. and Sampoorna, M. and Ramelli, R. and Anusha, L.S.}, url = {http://adsabs.harvard.edu/abs/2012A%26A...541A..24S}, doi = {10.1051/0004-6361/201118466}, year = {2012}, date = {2012-05-01}, journal = {Astronomy and Astrophysics}, volume = {541}, pages = {A24}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kleint, L; Shapiro, A I; Berdyugina, S V; Bianda, M Solar turbulent magnetic fields: Non-LTE modeling of the Hanle effect in the C2 molecule Journal Article In: Astronomy and Astrophysics, 536 , pp. A47, 2011. @article{2011A&A...536A..47K, title = {Solar turbulent magnetic fields: Non-LTE modeling of the Hanle effect in the C2 molecule}, author = {Kleint, L. and Shapiro, A.I. and Berdyugina, S.V. and Bianda, M.}, url = {http://adsabs.harvard.edu/abs/2011A%26A...536A..47K}, doi = {10.1051/0004-6361/201015857}, year = {2011}, date = {2011-12-01}, journal = {Astronomy and Astrophysics}, volume = {536}, pages = {A47}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Anusha, L S; Nagendra, K N; Bianda, M; Stenflo, J O; Holzreuter, R; Sampoorna, M; Frisch, H; Ramelli, R; Smitha, H N Analysis of the Forward-scattering Hanle Effect in the Ca I 4227 Å Line Journal Article In: Astrophysical Journal, 737 , pp. 95, 2011. @article{2011ApJ...737...95A, title = {Analysis of the Forward-scattering Hanle Effect in the Ca I 4227 Å Line}, author = {Anusha, L.S. and Nagendra, K.N. and Bianda, M. and Stenflo, J.O. and Holzreuter, R. and Sampoorna, M. and Frisch, H. and Ramelli, R. and Smitha, H.N.}, url = {http://data.irsol.ch/Papers/anusha2011.pdf}, doi = {10.1088/0004-637X/737/2/95}, year = {2011}, date = {2011-08-01}, journal = {Astrophysical Journal}, volume = {737}, pages = {95}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bianda, M; Ramelli, R; Anusha, L S; Stenflo, J O; Nagendra, K N; Holzreuter, R; Sampoorna, M; Frisch, H; Smitha, H N Observations of the forward scattering Hanle Effect the Ca I 4227 Å Line Journal Article In: Astronomy and Astrophysics, 530 , pp. L13, 2011. @article{2011A&A...530L..13B, title = {Observations of the forward scattering Hanle Effect the Ca I 4227 Å Line}, author = {Bianda, M. and Ramelli, R. and Anusha, L.S. and Stenflo, J.O. and Nagendra, K.N. and Holzreuter, R. and Sampoorna, M. and Frisch, H. and Smitha, H.N.}, url = {http://arxiv.org/abs/1105.2157}, doi = {10.1051/0004-6361/201117047}, year = {2011}, date = {2011-06-01}, journal = {Astronomy and Astrophysics}, volume = {530}, pages = {L13}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Shapiro, A I; Fluri, D M; Berdyugina, S V; Bianda, M; Ramelli, R NLTE modeling of Stokes vector center-to-limb variations in the CN violet system Journal Article In: Astronomy and Astrophysics, 529 , pp. A139, 2011. @article{2011A&A...529A.139S, title = {NLTE modeling of Stokes vector center-to-limb variations in the CN violet system}, author = {Shapiro, A.I. and Fluri, D.M. and Berdyugina, S.V. and Bianda, M. and Ramelli, R.}, url = {http://data.irsol.ch/Papers/aa11299-08.pdf}, doi = {10.1051/0004-6361/200811299}, year = {2011}, date = {2011-05-01}, journal = {Astronomy and Astrophysics}, volume = {529}, pages = {A139}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kleint, L; Berdyugina, S V; Shapiro, A I; Bianda, M Solar turbulent magnetic fields: surprisingly homogeneous distribution during the solar minimum Journal Article In: Astronomy and Astrophysics, 524 , pp. A37, 2010. @article{2010A&A...524A..37K, title = {Solar turbulent magnetic fields: surprisingly homogeneous distribution during the solar minimum}, author = {Kleint, L. and Berdyugina, S.V. and Shapiro, A.I. and Bianda, M.}, url = {http://data.irsol.ch/Papers/aa15285-10.pdf}, doi = {10.1051/0004-6361/201015285}, year = {2010}, date = {2010-12-01}, journal = {Astronomy and Astrophysics}, volume = {524}, pages = {A37}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Anusha, L S; Nagendra, K N; Stenflo, J O; Bianda, M; Sampoorna, M; Frisch, H; Holzreuter, R; Ramelli, R Generalization of the Last Scattering Approximation for the Second Solar Spectrum Modeling: The Ca I 4227 Å Line as a Case Study Journal Article In: Astrophysical Journal, 718 , pp. 988-1000, 2010. @article{2010ApJ...718..988A, title = {Generalization of the Last Scattering Approximation for the Second Solar Spectrum Modeling: The Ca I 4227 Å Line as a Case Study}, author = {Anusha, L.S. and Nagendra, K.N. and Stenflo, J.O. and Bianda, M. and Sampoorna, M. and Frisch, H. and Holzreuter, R. and Ramelli, R.}, url = {http://data.irsol.ch/Papers/anusha10.pdf}, doi = {10.1088/0004-637X/718/2/988}, year = {2010}, date = {2010-08-01}, journal = {Astrophysical Journal}, volume = {718}, pages = {988-1000}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Martínez González, M J; Manso Sainz, R; Asensio Ramos, A; López Ariste, A; Bianda, M Statistical Analysis of the very Quiet Sun Magnetism Journal Article In: The Astrophysical Journal Letters, 711 (2), pp. L57, 2010. @article{2041-8205-711-2-L57, title = {Statistical Analysis of the very Quiet Sun Magnetism}, author = {Martínez González, M.J. and Manso Sainz, R. and Asensio Ramos, A. and López Ariste, A. and Bianda, M.}, url = {http://stacks.iop.org/2041-8205/711/i=2/a=L57}, year = {2010}, date = {2010-01-01}, journal = {The Astrophysical Journal Letters}, volume = {711}, number = {2}, pages = {L57}, abstract = {The behavior of the observed polarization amplitudes with spatial resolution is a strong constraint on the nature and organization of solar magnetic fields below the resolution limit. We study the polarization of the very quiet Sun at different spatial resolutions using ground- and space-based observations. It is shown that 80% of the observed polarization signals do not change with spatial resolution, suggesting that, observationally, the very quiet Sun magnetism remains the same despite the high spatial resolution of space-based observations. Our analysis also reveals a cascade of spatial scales for the magnetic field within the resolution element. It is manifest that the Zeeman effect is sensitive to the microturbulent field usually associated with Hanle diagnostics. This demonstrates that Zeeman and Hanle studies show complementary perspectives of the same magnetism.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The behavior of the observed polarization amplitudes with spatial resolution is a strong constraint on the nature and organization of solar magnetic fields below the resolution limit. We study the polarization of the very quiet Sun at different spatial resolutions using ground- and space-based observations. It is shown that 80% of the observed polarization signals do not change with spatial resolution, suggesting that, observationally, the very quiet Sun magnetism remains the same despite the high spatial resolution of space-based observations. Our analysis also reveals a cascade of spatial scales for the magnetic field within the resolution element. It is manifest that the Zeeman effect is sensitive to the microturbulent field usually associated with Hanle diagnostics. This demonstrates that Zeeman and Hanle studies show complementary perspectives of the same magnetism. |
Sampoorna, M; Stenflo, J O; Nagendra, K N; Bianda, M; Ramelli, R; Anusha, L S Origin of Spatial Variations of Scattering Polarization in the Wings of the Ca I 4227 Å line Journal Article In: Astrophysical Journal, 699 , pp. 1650-1659, 2009. @article{2009ApJ...699.1650S, title = {Origin of Spatial Variations of Scattering Polarization in the Wings of the Ca I 4227 Å line}, author = {Sampoorna, M. and Stenflo, J.O. and Nagendra, K.N. and Bianda, M. and Ramelli, R. and Anusha, L.S.}, url = {http://data.irsol.ch/Papers/apj_699_2_1650.pdf}, doi = {10.1088/0004-637X/699/2/1650}, year = {2009}, date = {2009-07-01}, journal = {Astrophysical Journal}, volume = {699}, pages = {1650-1659}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bommier, V; Martínez González, M J; Bianda, M; Frisch, H; Asensio Ramos, A; Gelly, B; Landi Degl'Innocenti, E The quiet Sun magnetic field observed with ZIMPOL on THEMIS. I. The probability density function Journal Article In: Astronomy and Astrophysics, 506 , pp. 1415-1428, 2009. @article{2009A&A...506.1415B, title = {The quiet Sun magnetic field observed with ZIMPOL on THEMIS. I. The probability density function}, author = {Bommier, V. and Martínez González, M.J. and Bianda, M. and Frisch, H. and Asensio Ramos, A. and Gelly, B. and Landi Degl'Innocenti, E.}, url = {http://data.irsol.ch/Papers/bommier09.pdf}, doi = {10.1051/0004-6361/200811373}, year = {2009}, date = {2009-01-01}, journal = {Astronomy and Astrophysics}, volume = {506}, pages = {1415-1428}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Afram, N; Berdyugina, S V; Fluri, D M; Semel, M; Bianda, M; Ramelli, R First polarimetric observations and modeling of the FeH F4Δ-X4Δ system Journal Article In: Astronomy and Astrophysics, 473 , pp. L1-L4, 2007. @article{2007A&A...473L...1A, title = {First polarimetric observations and modeling of the FeH F4Δ-X4Δ system}, author = {Afram, N and Berdyugina, S.V. and Fluri, D.M. and Semel, M. and Bianda, M. and Ramelli, R.}, url = {http://data.irsol.ch/Papers/aa8109-07.pdf}, doi = {10.1051/0004-6361:20078109}, year = {2007}, date = {2007-10-01}, journal = {Astronomy and Astrophysics}, volume = {473}, pages = {L1-L4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Berdyugina, S V; Fluri, D M; Ramelli, R; Bianda, M; Gisler, D; Stenflo, J O First Polarimetric Measurements and Modeling of the Paschen-Back Effect in CaH Transitions Journal Article In: Astrophysical Journal, Letters, 649 , pp. L49-L52, 2006. @article{2006ApJ...649L..49B, title = {First Polarimetric Measurements and Modeling of the Paschen-Back Effect in CaH Transitions}, author = {Berdyugina, S.V. and Fluri, D.M. and Ramelli, R. and Bianda, M. and Gisler, D. and Stenflo, J.O.}, url = {http://data.irsol.ch/Papers/berdyugina06.pdf}, doi = {10.1086/508159}, year = {2006}, date = {2006-09-01}, journal = {Astrophysical Journal, Letters}, volume = {649}, pages = {L49-L52}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bianda, M; Benz, A O; Stenflo, J O; Küveler, G; Ramelli, R Absence of linear polarization in Hα emission of solar flares Journal Article In: Astronomy and Astrophysics, 434 , pp. 1183-1189, 2005. @article{2005A&A...434.1183B, title = {Absence of linear polarization in Hα emission of solar flares}, author = {Bianda, M. and Benz, A.O. and Stenflo, J.O. and Küveler, G. and Ramelli, R.}, url = {http://data.irsol.ch/Papers/aa1654.pdf}, doi = {10.1051/0004-6361:20041654}, year = {2005}, date = {2005-05-01}, journal = {Astronomy and Astrophysics}, volume = {434}, pages = {1183-1189}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Asensio Ramos, A; Trujillo Bueno, J; Bianda, M; Manso Sainz, R; Uitenbroek, H Observation of the Molecular Zeeman Effect in the G Band Journal Article In: Astrophysical Journal, Letters, 611 , pp. L61-L64, 2004. @article{2004ApJ...611L..61A, title = {Observation of the Molecular Zeeman Effect in the G Band}, author = {Asensio Ramos, A. and Trujillo Bueno, J. and Bianda, M. and Manso Sainz, R. and Uitenbroek, H.}, url = {http://data.irsol.ch/Papers/Asensio_gband.pdf}, doi = {10.1086/423617}, year = {2004}, date = {2004-08-01}, journal = {Astrophysical Journal, Letters}, volume = {611}, pages = {L61-L64}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Wiehr, E; Bianda, M Solar prominence polarimetry Journal Article In: Astronomy and Astrophysics, 404 , pp. L25-L28, 2003. @article{2003A&A...404L..25W, title = {Solar prominence polarimetry}, author = {Wiehr, E. and Bianda, M.}, url = {http://data.irsol.ch/Papers/Wiehr03.pdf}, doi = {10.1051/0004-6361:20030668}, year = {2003}, date = {2003-06-01}, journal = {Astronomy and Astrophysics}, volume = {404}, pages = {L25-L28}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Wiehr, E; Bianda, M High spatial resolution solar polarimetry with interference filters Journal Article In: Astronomy and Astrophysics, 398 , pp. 739-742, 2003. @article{2003A&A...398..739W, title = {High spatial resolution solar polarimetry with interference filters}, author = {Wiehr, E. and Bianda, M.}, url = {http://data.irsol.ch/Papers/AA398-739.pdf}, doi = {10.1051/0004-6361:20021515}, year = {2003}, date = {2003-02-01}, journal = {Astronomy and Astrophysics}, volume = {398}, pages = {739-742}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O; Gandorfer, A; Holzreuter, R; Gisler, D; Keller, C U; Bianda, M Spatial mapping of the Hanle and Zeeman effects on the Sun Journal Article In: Astronomy and Astrophysics, 389 , pp. 314-324, 2002. @article{2002A&A...389..314S, title = {Spatial mapping of the Hanle and Zeeman effects on the Sun}, author = {Stenflo, J.O. and Gandorfer, A. and Holzreuter, R. and Gisler, D. and Keller, C.U. and Bianda, M.}, url = {http://data.irsol.ch/Papers/AA389_314_2002.pdf}, doi = {10.1051/0004-6361:20020580}, year = {2002}, date = {2002-07-01}, journal = {Astronomy and Astrophysics}, volume = {389}, pages = {314-324}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dalrymple, N E; Bianda, M Fast Flat Fields from Moving Extended Sources Journal Article In: 34 , pp. 741, 2002. @article{2002AAS...200.5907D, title = {Fast Flat Fields from Moving Extended Sources}, author = {Dalrymple, N.E. and Bianda, M.}, url = {http://data.irsol.ch/Papers/Flatfield_2003.pdf}, year = {2002}, date = {2002-05-01}, booktitle = {American Astronomical Society Meeting Abstracts #200}, volume = {34}, pages = {741}, series = {Bulletin of the American Astronomical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bianda, M; Stenflo, J O; Solanki, S K Hanle effect observations with the CaI 4227 Å line Journal Article In: Astronomy and Astrophysics, 350 , pp. 1060-1070, 1999. @article{1999A&A...350.1060B, title = {Hanle effect observations with the CaI 4227 Å line}, author = {Bianda, M. and Stenflo, J.O. and Solanki, S.K.}, url = {http://data.irsol.ch/Papers/AA350_1060_1999.pdf}, year = {1999}, date = {1999-10-01}, journal = {Astronomy and Astrophysics}, volume = {350}, pages = {1060-1070}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bianda, M; Stenflo, J O; Solanki, S K Hanle diagnostics of solar magnetic fields: the SrII 4078 Å line Journal Article In: Astronomy and Astrophysics, 337 , pp. 565-578, 1998. @article{1998A&A...337..565B, title = {Hanle diagnostics of solar magnetic fields: the SrII 4078 Å line}, author = {Bianda, M. and Stenflo, J.O. and Solanki, S.K.}, url = {http://data.irsol.ch/Papers/AA337_565_1998.pdf}, year = {1998}, date = {1998-09-01}, journal = {Astronomy and Astrophysics}, volume = {337}, pages = {565-578}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bianda, M; Solanki, S K; Stenflo, J O Hanle depolarisation in the solar chromosphere Journal Article In: Astronomy and Astrophysics, 331 , pp. 760-770, 1998. @article{1998A&A...331..760B, title = {Hanle depolarisation in the solar chromosphere}, author = {Bianda, M. and Solanki, S.K. and Stenflo, J.O.}, url = {http://data.irsol.ch/Papers/AA331_760_1998.pdf}, year = {1998}, date = {1998-03-01}, journal = {Astronomy and Astrophysics}, volume = {331}, pages = {760-770}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Stenflo, J O; Bianda, M; Keller, C U; Solanki, S K Center-to-limb variation of the second solar spectrum. Journal Article In: Astronomy and Astrophysics, 322 , pp. 985-994, 1997. @article{1997A&A...322..985S, title = {Center-to-limb variation of the second solar spectrum.}, author = {Stenflo, J.O. and Bianda, M. and Keller, C.U. and Solanki, S.K.}, url = {http://data.irsol.ch/Papers/AA322_985_1997.pdf}, year = {1997}, date = {1997-06-01}, journal = {Astronomy and Astrophysics}, volume = {322}, pages = {985-994}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Sütterlin, P; Wiehr, E; Bianda, M; Kueveler, G Problems in measuring prominence oscillations. Journal Article In: Astronomy and Astrophysics, 321 , pp. 921-926, 1997. @article{1997A&A...321..921S, title = {Problems in measuring prominence oscillations.}, author = {Sütterlin, P. and Wiehr, E. and Bianda, M. and Kueveler, G.}, url = {http://data.irsol.ch/Papers/AA321-921.pdf}, year = {1997}, date = {1997-05-01}, journal = {Astronomy and Astrophysics}, volume = {321}, pages = {921-926}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Solanki, S K; Rueedi, I; Bianda, M; Steffen, M On the detection of shocks in the solar granulation. Journal Article In: Astronomy and Astrophysics, 308 , pp. 623-630, 1996. @article{1996A&A...308..623S, title = {On the detection of shocks in the solar granulation.}, author = {Solanki, S.K. and Rueedi, I. and Bianda, M. and Steffen, M.}, url = {http://data.irsol.ch/Papers/1996A+A...308..623S.pdf}, year = {1996}, date = {1996-01-01}, journal = {Astronomy and Astrophysics}, volume = {308}, pages = {623-630}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Wittmann, A D; Alge, E; Bianda, M Detection of a significant change in the solar diameter Journal Article In: Solar Physics, 145 , pp. 205, 1993. @article{1993SoPh..145..205W, title = {Detection of a significant change in the solar diameter}, author = {Wittmann, A.D. and Alge, E. and Bianda, M.}, url = {http://data.irsol.ch/Papers/1993SoPh..145..205W.pdf}, doi = {10.1007/BF00627996}, year = {1993}, date = {1993-05-01}, journal = {Solar Physics}, volume = {145}, pages = {205}, keywords = {}, pubstate = {published}, tppubtype = {article} } |