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The cooling of coronal plasmas. IV. Catastrophic cooling of loops

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Cargill_2013_TAJ_TheCooling.pdf (169.8Kb)
Date
20/07/2013
Author
Cargill, P.J.
Bradshaw, S.J.
Keywords
Sun: corona
Sun: transition region
QB Astronomy
QC Physics
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Abstract
We examine the radiative cooling of coronal loops and demonstrate that the recently identified catastrophic cooling is due to the inability of a loop to sustain radiative/enthalpy cooling below a critical temperature, which can be >1 MK in flares, 0.5-1 MK in active regions, and 0.1 MK in long tenuous loops. Catastrophic cooling is characterized by a rapid fall in coronal temperature, while the coronal density changes by a small amount. Analytic expressions for the critical temperature are derived and show good agreement with numerical results. This effect considerably limits the lifetime of coronal plasmas below the critical temperature.
Citation
Cargill , P J & Bradshaw , S J 2013 , ' The cooling of coronal plasmas. IV. Catastrophic cooling of loops ' , Astrophysical Journal , vol. 772 , no. 1 , 40 . https://doi.org/10.1088/0004-637X/772/1/40
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/772/1/40
ISSN
0004-637X
Type
Journal article
Rights
© 2013. The American Astronomical Society. All rights reserved.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5503

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

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