Nonequilibrium in sheared axisymmetric force-free magnetic fields

Details Nonequilibrium in sheared axisymmetric force-free magnetic fields Nonequilibrium in sheared axisymmetric force-free magnetic fields

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439l..63a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 439, no. 2, p. L63-L66

Astronomy and Astrophysics

Astrophysics

25

Force-Free Magnetic Fields, Magnetohydrodynamics, Mathematical Models, Nonequilibrium Conditions, Shearing, Symmetry, Quasi-Steady States, Solar Corona, Solar Flares, Solar Magnetic Field

Scientific paper

The problem of the ideal evolution through a sequence of force-free configurations of an axisymmetric magnetic field occupying the region outside a sphere is considered. The field is initially a potential arcade, and its footpoints on the boundary are slowly sheared by azimuthal stationary motions. It is shown on general grounds that, after an initial phase during which energy gets quietly stored, the field starts expanding at an increasing rate, approaching very rapidly an open field (possibly reached at finite time] -- which implies in general a breakdown of the quasi-static approximation at some stage. he possible importance of this result for our understanding of eruptive processes in the solar corona is emphasized.

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