2016
|
Supriya, H D; Sampoorna, M; Nagendra, K N; Stenflo, J ~O; Ravindra, B Polarized Line Formation with Lower-level Polarization and Partial Frequency Redistribution Journal Article In: Astrophysical Journal, 828 , pp. 84, 2016. Abstract | Links | BibTeX @article{2016ApJ...828...84S,
title = {Polarized Line Formation with Lower-level Polarization and Partial Frequency Redistribution},
author = {Supriya, H.D. and Sampoorna, M. and Nagendra, K.N. and
Stenflo, J.~O. and Ravindra, B.},
doi = {10.3847/0004-637X/828/2/84},
year = {2016},
date = {2016-01-01},
journal = {Astrophysical Journal},
volume = {828},
pages = {84},
abstract = {In the well-established theories of polarized line formation with
partial frequency redistribution (PRD) for a two-level and two-term
atom, it is generally assumed that the lower level of the scattering
transition is unpolarized. However, the existence of unexplained
spectral features in some lines of the Second Solar Spectrum points
toward a need to relax this assumption. There exists a density matrix
theory that accounts for the polarization of all the atomic levels, but
it is based on the flat-spectrum approximation (corresponding to
complete frequency redistribution). In the present paper we propose a
numerical algorithm to solve the problem of polarized line formation in
magnetized media, which includes both the effects of PRD and the lower
level polarization (LLP) for a two-level atom. First we derive a
collisionless redistribution matrix that includes the combined effects
of the PRD and the LLP. We then solve the relevant transfer equation
using a two-stage approach. For illustration purposes, we consider two case studies in the non-magnetic regime, namely, the J $_ a $ = 1, J $_ b $ = 0 and J $_ a $ = J $_ b $ = 1,
where J $_ a $ and J $_ b $ represent the total angular
momentum quantum numbers of the lower and upper states, respectively.
Our studies show that the effects of LLP are significant only in the
line core. This leads us to propose a simplified numerical approach to
solve the concerned radiative transfer problem. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the well-established theories of polarized line formation with
partial frequency redistribution (PRD) for a two-level and two-term
atom, it is generally assumed that the lower level of the scattering
transition is unpolarized. However, the existence of unexplained
spectral features in some lines of the Second Solar Spectrum points
toward a need to relax this assumption. There exists a density matrix
theory that accounts for the polarization of all the atomic levels, but
it is based on the flat-spectrum approximation (corresponding to
complete frequency redistribution). In the present paper we propose a
numerical algorithm to solve the problem of polarized line formation in
magnetized media, which includes both the effects of PRD and the lower
level polarization (LLP) for a two-level atom. First we derive a
collisionless redistribution matrix that includes the combined effects
of the PRD and the LLP. We then solve the relevant transfer equation
using a two-stage approach. For illustration purposes, we consider two case studies in the non-magnetic regime, namely, the J $_ a $ = 1, J $_ b $ = 0 and J $_ a $ = J $_ b $ = 1,
where J $_ a $ and J $_ b $ represent the total angular
momentum quantum numbers of the lower and upper states, respectively.
Our studies show that the effects of LLP are significant only in the
line core. This leads us to propose a simplified numerical approach to
solve the concerned radiative transfer problem. |
2015
|
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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @article{2015A&A...573A..74S,
title = {FTS atlas of the Sun's spectrally resolved center-to-limb variation},
author = {Stenflo, J.O.},
url = {https://www.irsol.usi.ch/data/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}
}
|
2014
|
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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @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. Links | BibTeX @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. Abstract | Links | BibTeX @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. |
2013
|
Stenflo, J O Solar magnetic fields as revealed by Stokes polarimetry Journal Article In: Astronomy and Astrophysics Reviews, 21 , pp. 66, 2013. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @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}
}
|
2012
|
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. Links | BibTeX @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. Links | BibTeX @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}
}
|
2011
|
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. Links | BibTeX @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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
2010
|
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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Abstract | Links | BibTeX @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. |
2009
|
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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
2007
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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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
2006
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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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
2005
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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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
2004
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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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
2003
|
Wiehr, E; Bianda, M Solar prominence polarimetry Journal Article In: Astronomy and Astrophysics, 404 , pp. L25-L28, 2003. Links | BibTeX @article{2003A&A...404L..25W,
title = {Solar prominence polarimetry},
author = {Wiehr, E. and Bianda, M.},
url = {https://www.irsol.usi.ch/data/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. Links | BibTeX @article{2003A&A...398..739W,
title = {High spatial resolution solar polarimetry with interference filters},
author = {Wiehr, E. and Bianda, M.},
url = {https://www.irsol.usi.ch/data/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}
}
|
2002
|
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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @article{2002AAS...200.5907D,
title = {Fast Flat Fields from Moving Extended Sources},
author = {Dalrymple, N.E. and Bianda, M.},
url = {https://www.irsol.usi.ch/data/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}
}
|
1999
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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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
1998
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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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @article{1998A&A...331..760B,
title = {Hanle depolarisation in the solar chromosphere},
author = {Bianda, M. and Solanki, S.K. and Stenflo, J.O.},
url = {https://www.irsol.usi.ch/data/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}
}
|
1997
|
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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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. Links | BibTeX @article{1997A&A...321..921S,
title = {Problems in measuring prominence oscillations.},
author = {Sütterlin, P. and Wiehr, E. and Bianda, M. and Kueveler, G.},
url = {https://www.irsol.usi.ch/data/Papers/AA321-921.pdf},
year = {1997},
date = {1997-05-01},
journal = {Astronomy and Astrophysics},
volume = {321},
pages = {921-926},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1996
|
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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
1993
|
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. Links | BibTeX @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 = {https://www.irsol.usi.ch/data/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}
}
|
1991
|
Wittmann, A D; Alge, E; Bianda, M Recent results on the solar diameter Journal Article In: Solar Physics, 135 , pp. 243-248, 1991. Links | BibTeX @article{1991SoPh..135..243W,
title = {Recent results on the solar diameter},
author = {Wittmann, A.D. and Alge, E. and Bianda, M.},
url = {https://www.irsol.usi.ch/data/Papers/1991SoPh..135..243W.pdf},
doi = {10.1007/BF00147498},
year = {1991},
date = {1991-10-01},
journal = {Solar Physics},
volume = {135},
pages = {243-248},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
