Physics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47..223h&link_type=abstract
(NASA, IAU, IUGG, and International Council of Scientific Unions, Workshop on Flare Build-up Study, Falmouth, Mass., Sept. 8-11,
Physics
32
Current Sheets, Magnetohydrodynamic Flow, Photosphere, Solar Atmosphere, Solar Flares, Solar Magnetic Field, Electric Fields, Electrical Resistivity, Magnetic Flux, Solar Physics, Thermodynamic Equilibrium, Transport Properties
Scientific paper
Physical conditions in a stationary flow of the Petchek type, allowing reconnection between flux emerging from below the solar photosphere and a preexisting magnetic field, are discussed. It is shown that, when rising in the solar atmosphere, the reconnection region has at first a rather low temperature as compared with its environment. Above a certain critical height, however, this low-temperature thermal equilibrium often ceases to be possible, and the sheet rapidly heats, seeking a new thermal equilibrium. During this dynamical process, current-driven microinstabilities may be triggered in the current sheet, giving rise to an enhanced resistivity. High-energy particles might be produced by the induced electric field developed during the rapid readjustment of MHD flows that results from this change in the transport properties of the plasma.
Heyvaerts Jean
Priest Eric R.
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