Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..402c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 402-408.
Astronomy and Astrophysics
Astrophysics
21
Coronal Loops, Magnetohydrodynamic Stability, Solar Flares, Solar Magnetic Field, Elastic Waves, Magnetic Flux, Perturbation Theory, Photosphere
Scientific paper
The ideal magnetohydrodynamic stability of solar coronal arcades where all the field lines are tied to the photosphere is examined. Two sets of photospheric boundary conditions are examined, and the first detailed quantitative comparison is presented. It is found that conditions where all components of the perturbation vanish at the photosphere are significantly more stable to interchange modes than those for which a displacement along the field lines is allowed there. Much stronger radial pressure gradients are needed to destabilize the former case. It is also found that three sample force-free fields are stable to all perturbations which were imposed. These results outline a pressing need for a more precise treatment of the transition region/corona boundary in stability problems.
Cargill Peter J.
Hood Alan William
Migliuolo Stefano
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