Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..820m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 820-831.
Astronomy and Astrophysics
Astrophysics
25
Force-Free Magnetic Fields, Magnetohydrodynamic Stability, Solar Corona, Solar Prominences, Coronal Loops, Propagation Modes, Solar Magnetic Field
Scientific paper
The formal theory of the MHD stability of solar coronal arcades is developed for the case where all the magnetic field lines defining the arcade are tied to the 'photosphere.' The assumption that even and odd modes are decoupled permits consideration of a restricted set of perturbations. It is shown that resistive tearing modes then play no important role in the stability of such configurations. The stability of ideal MHD modes is analyzed in detail, and the strong stabilizing effects of line-tying are presented. Several model force-free equilibrium configurations are shown to be absolutely stable. An energy integral, appropriate for line-tied arcades, is presented and discussed.
Cargill Peter J.
Migliuolo Stefano
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