Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..820m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 820-833.
Astronomy and Astrophysics
Astrophysics
25
Coronal Loops, Magnetohydrodynamic Stability, Solar Activity, Thermal Stability, Chromosphere, Heating
Scientific paper
The thermal stability of solar coronal loops is analyzed. The equilibrium structure of loops is discussed, emphasizing the role of the heating mechanism in defining the loop structure. The inadequacies of the 'thermally isolated' loop model are pointed out, and the necessity for a continuous variation of the heating rate at the base of the transition region is stressed. It is argued that the loop plasma must contain a zone of 'intrinsic instability' irrespective of the actual heating mechanism. The boundary conditions imposed at the loop footpoints by the chromosphere are examined, and the coronal stability equation is formulated. An analysis of antisymmetric modes is given under the assumption that the heating rate is independent of position; the nonphysical constant-pressure symmetric modes are also discussed. The analytical results are supported by numerical ones on symmetric modes with varying pressure.
Craig Donald I. Jr.
McClymont Alexander N.
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