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Thermal stability of static coronal loops. I - Effects of boundary conditionsThe linear stability of static coronal-loop models undergoing thermal perturbations was investigated. The effect of conditions at the loop base on the stability properties of the models was considered in detail. The question of appropriate boundary conditions at the loop base was considered and it was concluded that the most physical assumptions are that the temperature and density (or pressure) perturbations vanish there. However, if the base is taken to be sufficiently deep in the chromosphere, either several chromospheric scale heights or several coronal loop lengths in depth, then the effect of the boundary conditions on loop stability becomes negligible so that all physically acceptable conditions are equally appropriate. For example, one could as well assume that the velocity vanishes at the base. The growth rates and eigenmodes of static models in which gravity is neglected and in which the coronal heating is a relatively simple function, either constant per-unit mass or per-unit volume were calculated. It was found that all such models are unstable with a growth rate of the order of the coronal cooling time. The physical implications of these results for the solar corona and transition region are discussed.
Document ID
19860032530
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Antiochos, S. K.
(Stanford Univ. CA, United States)
Shoub, E. C.
(Stanford, University CA, United States)
An, C.-H.
(NASA Marshall Space Flight Center Huntsville, AL; California, University, San Diego, United States)
Emslie, A. G.
(Alabama, University Huntsville, AL, United States)
Date Acquired
August 12, 2013
Publication Date
November 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 298
ISSN: 0004-637X
Subject Category
Solar Physics
Report/Patent Number
AD-A170028
Accession Number
86A17268
Funding Number(s)
CONTRACT_GRANT: N00014-85-K-0111
CONTRACT_GRANT: NAGW-92
CONTRACT_GRANT: NGL-05-020-272
CONTRACT_GRANT: NSG-7406
Distribution Limits
Public
Copyright
Other

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