Hostname: page-component-745bb68f8f-d8cs5 Total loading time: 0 Render date: 2025-01-11T05:17:07.612Z Has data issue: false hasContentIssue false
  • English
  • Français

Three-dimensional simulations of scattering polarization and the Hanle effect in MHD chromospheric models

Published online by Cambridge University Press:  24 July 2015

J. Štěpán
J. Štěpán*
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 251 65 Ondřejov, Czech Republic email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Scattering line polarization and the Hanle effect are among the most important mechanisms for diagnostics of the solar and stellar atmospheres. The fact that real stellar atmospheres are horizontally inhomogeneous makes the spectral synthesis and interpretation very challenging because the effect of thermodynamic fluctuations on spectral line polarization is entangled with the action of magnetic fields. This applies to the spatially resolved as well as to the averaged spectra. The necessary step towards the interpretation of such spectra is to study the line formation in sufficiently realistic 3D MHD models and compare the synthetic spectra with observations. This paper gives an overview of recent progress in the field of 3D NLTE synthesis of polarized spectral lines resulting from investigations with the radiative transfer code PORTA.

Keywords

Polarizationradiative transferscatteringSun: chromosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S305: Polarimetry: From the Sun to Stars and Stellar Environments , December 2014 , pp. 360 - 367
Copyright
Copyright © International Astronomical Union 2015 

References

Anusha, L. S., Nagendra, K. N., Bianda, M., Stenflo, J. O., Holzreuter, R., Sampoorna, M., Frisch, H., Ramelli, R., & Smitha, H. N. 2011, ApJ 737, 95 Google Scholar
Bianda, M., Ramelli, R., Anusha, L. S., Stenflo, J. O., Nagendra, K. N., Holzreuter, R., Sampoorna, M., Frisch, H., & Smitha, H. N. 2011, A&A 530, L13 Google Scholar
Carlsson, M., Hansteen, V., Gudiksen, B. V., Leenaarts, J., & De Pontieu, B. 2015, in preparationGoogle Scholar
De Pontieu, et al. 2014, Sol. Phys. 289, 2733 CrossRefGoogle Scholar
Gudiksen, B. V., Carlsson, M., Hansteen, V. H., Hayek, W., Leenaarts, J., & Martínez-Sykora, J. 2011, A&A 531, 154 Google Scholar
Ishikawa, R. et al. 2014, ApJ 787, 159 CrossRefGoogle Scholar
Landi Degl'Innocenti, E. & Landolfi, M. 2004, Polarization in spectral lines, Kluwer, Dordrecht Google Scholar
Leenaarts, J., Carlsson, M. & Rouppe van der Voort, L. 2012, ApJ 749, 136 Google Scholar
Manso Sainz, R. & Trujillo Bueno, J. 2010, ApJ 722, 1416 Google Scholar
Manso Sainz, R. & Trujillo Bueno, J. 2011, ApJ 743, 12 Google Scholar
Stenflo, J. O. & Keller, C. U. 1997, A&A 321, 927 Google Scholar
Štěpán, J. & Trujillo Bueno, J. 2010, ApJ 711, L133 Google Scholar
Štěpán, J. & Trujillo Bueno, J. 2013, A&A 557, 143 Google Scholar
Štěpán, J., Trujillo Bueno, J., Leenaarts, J., & Carlsson, M. 2015, ApJ in press, arXiv:1501.06382Google Scholar
Trujillo Bueno, J. 2001, in: Sigwarth, M. (ed.), Advanced Solar Polarimetry – Theory, Observation, and Instrumentation, ASP Conf. Series 236 (San Francisco: ASP), p. 161 Google Scholar
Trujillo Bueno, J., Landi Degl'Innocenti, E., Collados, M., Merenda, L., & Manso Sainz, R. 2002, Nature 415, 403 Google Scholar