Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988baicz..39...13k&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 39, Jan. 1988, p. 13-23.
Astronomy and Astrophysics
Astronomy
15
Current Sheets, Electrical Resistivity, Electron Beams, Magnetic Field Reconnection, Solar Flares, Solar Magnetic Field, Current Density, Electric Current, Magnetohydrodynamic Flow, Time Dependence
Scientific paper
The initiation of a solar flare by an electron beam from a distant previous flare via the mechanism proposed by Farnik et al. (1983) is investigated by means of numerical simulations, extending the analysis of Ugai (1980, 1982, and 1983) to focus on the evolution of the current sheet after a rectangular pulse of increased electrical resistivity has ended. The derivation of the governing equations is recalled, and the simulation results are presented in extensive graphs. The reconnection of magnetic-field lines after the pulse is found to be associated with local field-line diffusion, an X-type field configuration, locally enhanced Joule heating, and vortex formation near the X point (leading to quasi-steady plasma flow). The current at the X point decreases and changes sign during the period of vortex flow but then increases rapidly when the vortex disappears.
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