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Title:
On the large-scale magnetostatic coronal structures and their stability
Authors:
Low, B. C.
Affiliation:
AA(High Altitude Observatory, Boulder, CO)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 15, 1984, p. 772-786. (ApJ Homepage)
Publication Date:
11/1984
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
CORONAL LOOPS, MAGNETOHYDRODYNAMIC STABILITY, MAGNETOSTATIC FIELDS, SOLAR CORONA, SOLAR MAGNETIC FIELD, CONTINUUM MECHANICS, LINES OF FORCE
DOI:
10.1086/162654
Bibliographic Code:
1984ApJ...286..772L

Abstract

A class of solutions to magnetostatic calculations is examined for their fruitfulness in predicting the structures of solar coronal loops and their hydromagnetic stability in the presence of linear perturbations. An ideal, one-fluid, MHD equation describes a polytropic plasma and stability is analyzed rigorously in terms of continuum mechanics. It is noted that the polytropic approximation is crude, since little is known of coronal heating processes, but that the approach is transparent to easy physical interpretation. Attention is focused on global closed magnetic fields and classical helmet-streamer structures. Two classes of magnetostatic equilibrium solutions are obtained, and the existence of an open magnetic field is shown to lead to unstable equilibrium when the base length of the closed field region reaches a critical magnitude. No conclusions could be drawn regarding stability below the critical value.

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