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Record Details

Record 53 of 3148
Effects of Mg II and Ca II ionization on ab-initio solar chromosphere models
Author and Affiliation:
Rammacher, W.(Heidelberg, Universitaet, Federal Republic of Germany, United States)
Cuntz, M.(Joint Institute for Laboratory Astrophysics, Boulder, CO, United States)
Abstract: Acoustically 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.
Publication Date: Oct 01, 1991
Document ID:
19920029350
(Acquired Nov 22, 1995)
Accession Number: 92A11974
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: Astronomy and Astrophysics (ISSN 0004-6361); 250; 1, Oc
Publisher Information: Germany
Contract/Grant/Task Num: DFG-CU-19/1-2; NGL-06-003-057
Financial Sponsor: NASA; United States
Organization Source: Heidelberg Univ.; Heidelberg, Germany
Joint Inst. for Lab. Astrophysics; Boulder, CO, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CALCIUM; CHROMOSPHERE; EMISSION SPECTRA; MAGNESIUM; SOLAR ATMOSPHERE; STELLAR MODELS; MAGNETOHYDRODYNAMICS; METAL IONS; RADIATIVE TRANSFER
Imprint And Other Notes: Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 212-219.
Availability Source: Other Sources
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