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Effect of thermal conduction and radiation on the dynamics of a flaring coronal loop

✍ Scribed by S. T. Wu; L. C. Kan; Y. Nakagawa; E. Tandberg-Hanssen

Publisher: Springer
Year: 1981
Tongue: English
Weight: 562 KB
Volume: 70
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00154397

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✦ Synopsis

A systematic study of the effects of thermal conduction and radiation (Cox-Tucker type) on the dynamic response of a coronal loop is presented. The study is based on a one-fluid hydrodynamic description of a magnetic flux loop subject to a sudden localized heating, simulating the flare energy release. Numerical results are obtained for the heating of a full loop at one end and symmetrical heating at both ends. The results show that: (1) The basic response is the propagation of a hydrodynamic shock; (2) thermal conduction (Coulomb type) has significant effects; and (3) radiation has only minor influence unless the density exceeds 1011 cm -3. It is noted that the uniform flaring of a loop is associated with heating of long duration. Short pulse-like heating results in the nonuniform brightening and propagation of luminous fronts similar to that sometimes observed in flare loops.

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