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Effects of Mg II and Ca II ionization on ab-initio solar chromosphere modelsAcoustically heated solar chromosphere models are computed considering radiation damping by (non-LTE) emission from H(-) and by Mg II and Ca II emission lines. The radiative transfer equations for the Mg II k and Ca II K emission lines are solved using the core-saturation method with complete redistribution. The Mg II k and Ca II K cooling rates are compared with the VAL model C. Several substantial improvements over the work of Ulmschneider et al. (1987) are included. It is found that the rapid temperature rises caused by the ionization of Mg II are not formed in the middle chromosphere, but occur at larger atmospheric heights. These models represent the temperature structure of the 'real' solar chromosphere much better. This result is a major precondition for the study of ab-initio models for solar flux tubes based on MHD wave propagation and also for ab-initio models for the solar transition layer.
Document ID
19920029350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rammacher, W.
(Heidelberg, Universitaet Federal Republic of Germany, United States)
Cuntz, M.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1991
Publication Information
Publication: Astronomy and Astrophysics
Volume: 250
Issue: 1 c
ISSN: 0004-6361
Subject Category
Solar Physics
Accession Number
92A11974
Funding Number(s)
CONTRACT_GRANT: DFG-CU-19/1-2
CONTRACT_GRANT: NGL-06-003-057
Distribution Limits
Public
Copyright
Other

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