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Issue A&A Volume 371, Number 3, June I 2001 Page(s) 1128 - 1136 Section The Sun DOI 10.1051/0004-6361:20010464

A&A 371, 1128-1136 (2001)
DOI: 10.1051/0004-6361:20010464

Investigation of temperature and velocity fluctuations through the solar photosphere with the Na I D lines

M. T. Eibe¹, P. Mein¹, Th. Roudier² and M. Faurobert<sup>3

1</sup>  DASOP, Observatoire de Paris, Section de Meudon, 92195 Meudon, France
    e-mail: Pierre.Mein@obspm.fr
²  Laboratoire d'Astrophysique de Toulouse, Observatoire Midi-Pyrénées, 14 avenue E. Belin, 31400 Toulouse, France
    e-mail: thierry.roudier@bagn.obs-mip.fr
³  Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 04, France
    e-mail: faurob@obs-nice.fr

(Received 26 January 2001 / Accepted 7 March 2001 )

Abstract
In this work we explore the diagnostic properties of the Na I D resonance lines by calculating the response functions of their line profiles to temperature and velocity perturbations in the atmosphere. We propose a method to transform spectral line intensity fluctuations measured at several wavelengths into temperature and velocity disturbances at different height levels. Results from tests done with several theoretical models of perturbations are discussed. Perturbations that vary as linear functions of depth are efficiently reproduced. The method also provides good estimations for exponential models. As an example we present an application to solar granulation data obtained with Multichannel Subtractive Double Pass (MSDP) spectroscopy.

Key words: line: profile -- Sun: photosphere -- Sun: granulation

Offprint request: M. T. Eibe, Teresa.Eibe@obspm.fr

© ESO 2001

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