Kerr, G., Fletcher, L. , Russell, A. J.B. and Allred, J. C. (2016) Simulations of the Mg II k and Ca II 8542 lines from an Alfvén wave-heated flare chromosphere. Astrophysical Journal, 827(2), 101. (doi: 10.3847/0004-637X/827/2/101)
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Abstract
We use radiation hydrodynamic simulations to examine two models of solar flare chromospheric heating: Alfven wave dissipation and electron beam collisional losses. Both mechanisms are capable of strong chro- ´ mospheric heating, and we show that the distinctive atmospheric evolution in the mid-to-upper chromosphere results in Mg ii k-line emission that should be observably different between wave-heated and beam-heated simulations. We also present Ca ii 8542Å profiles which are formed slightly deeper in the chromosphere. The Mg ii k-line profiles from our wave-heated simulation are quite different from those from a beam-heated model and are more consistent with IRIS observations. The predicted differences between the Ca ii 8542Å in the two models are small. We conclude that careful observational and theoretical study of lines formed in the mid-toupper chromosphere holds genuine promise for distinguishing between competing models for chromospheric heating in flares.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Fletcher, Professor Lyndsay and Russell, Dr Alexander and Kerr, Graham |
Authors: | Kerr, G., Fletcher, L., Russell, A. J.B., and Allred, J. C. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Astrophysical Journal |
Publisher: | IOP Publishing |
ISSN: | 0004-637X |
ISSN (Online): | 1538-4357 |
Published Online: | 11 August 2016 |
Copyright Holders: | Copyright © 2016 IOP Publishing Ltd |
First Published: | First published in Astrophysical Journal 827(2): 101 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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