Magnetic arcade evolution and instability

Details Magnetic arcade evolution and instability Magnetic arcade evolution and instability

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..120...49b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 120, no. 1, 1989, p. 49-77.

Physics

103

Solar Corona, Solar Magnetic Field, Magnetic Field Configurations, Magnetohydrodynamic Stability, Shear Flow

Scientific paper

A series of dynamical computations of arcade evolution using a variety of initial, boundary, and driving conditions as well as Reynolds numbers is presented. Laterally restricted arcades, freely expanding arcades, and arcades carrying a current filament are considered. A quasi-self-similar stable behavior is obtained in all cases. The evolution of configurations containing several interacting arcades is examined. In the case of a laterally restricted pair of arcades, resistive instability and plasmoid upward ejection occur under rather general conditions. In the more relevant case of a group of arcades restricted only by their mutual interaction, noneruptive plasmoid formation seems to occur quite generally in each arcade, corresponding to the transition to a bifurcated equilibrium. The evolution, however, remains slow. Only for sufficiently complex configuration containing at least three arcades is eruptive plasmoid formation observed.

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