Physics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...69..119w&link_type=abstract
Solar Physics, vol. 69, Jan. 1981, p. 119-130.
Physics
Energy Dissipation, Magnetohydrodynamic Turbulence, Shock Wave Propagation, Solar Flares, Solar Magnetic Field, Abundance, Current Sheets, Electrostatic Waves, Neutral Sheets, Propagation Modes, Solar Corona
Scientific paper
The triggering of large-scale dissipation of magnetic energy by fast-mode shocks, a process thought to result in solar flares, is examined. The triggering effect requires turbulent heating, subsequent broadening of the shock and eventual steepening. MHD shocks are found to be the most probable candidates for satisfying the requirements of obtaining large enough currents for turbulence to occur. Though the thermal results do in fact destroy the conditions of turbulence in a fast MHD shock, it is shown that the nonlinear steepening mechanism of such a shock is able to restore and maintain the driving current for a large range of parameters, over a long time and over large distances. Shock thickness is found to be the critical parameter, not only for the occurrence of turbulence but also for the restoration of the driving current.
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