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Title:
The thermal evolution of resonantly heated coronal loops
Authors:
Martens, P. C. H.; Kuin, N. P. M.
Affiliation:
AA(Sterrewacht Sonnenborgh, Utrecht, Netherlands), AB(Sterrewacht Sonnenborgh, Utrecht, Netherlands)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 2, July 1983, p. 216-224. (A&A Homepage)
Publication Date:
07/1983
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
CORONAL LOOPS, PLASMA HEATING, PLASMA RESONANCE, STELLAR MODELS, TEMPERATURE DISTRIBUTION, ELECTRODYNAMICS, PLASMA TEMPERATURE, TIME DEPENDENCE, X RAY SPECTRA
Bibliographic Code:
1983A&A...123..216M

Abstract

The time-dependent model of Kuin and Martens (1982) for the thermal structure of the plasma in a coronal loop is extended to account for the mechanism of resonant electrodynamic heating (Ionson, 1982). It is found that, just as in the models of constant heating of Kuin and Martens, the static thermal equilibrium for the loops is unstable and that the time dependent solutions for the plasma in a loop are cyclic, consisting of a short cool phase and a long hot phase. This last phase is almost identical to the static solution and this explains the static appearance of a loop. In addition to this cyclic behaviour catastrophic transitions in the X-ray emission of a loop may occur, as a result of a gradual change in the loop length or the magnetic field strength. Finally a comparison is made with the numerical solutions for the evolution of the plasma in coronal loops by other authors.

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