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Inclusion of velocity gradients in the Unno solution for magnetic field diagnostic from spectropolarimetric data

Published online by Cambridge University Press:  08 June 2011

Guillaume Molodij  and
Véronique Bommier
Guillaume Molodij
Affiliation:
LESIA, UMR 8109 CNRS, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon principal email: [email protected]
Véronique Bommier
Affiliation:
LERMAUMR 8112 CNRS, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon principal email: [email protected]
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Abstract

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We present an extension of the Unno-Rachkovsky solution that provides the theoretical profiles coming out of a Milne-Eddington atmosphere imbedded in a magnetic field, to the additional taking into account of a vertical velocity gradient. Thus, the theoretical profiles may display asymmetries as do the observed profiles, which facilitates the inversion based on the Unno-Rachkovsky theory, and leads to the additional determination of the vertical velocity gradient. We present UNNOFIT inversion on spectropolarimetric data performed on an active region of the Sun with the french-italian telescope THEMIS operated by CNRS and CNR on the island of Tenerife.

Keywords

Sun: magnetic fieldspolarizationline: profilesradiative transfermethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 291 - 294
Copyright
Copyright © International Astronomical Union 2011

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