Physics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47...41p&link_type=abstract
(NASA, IAU, IUGG, and International Council of Scientific Unions, Workshop on Flare Build-up Study, Falmouth, Mass., Sept. 8-11,
Physics
38
Atmospheric Models, Current Sheets, Magnetic Field Configurations, Magnetic Field Reconnection, Solar Atmosphere, Solar Flares, Solar Magnetic Field, Chromosphere, Force-Free Magnetic Fields, H Alpha Line, Magnetohydrodynamic Waves, Propagation Velocity, Solar Physics, Stellar Models
Scientific paper
Basic properties of current sheets are analyzed, including the processes of magnetic-field reconnection and annihilation, the formation of a sheet, and the tearing-mode instability. The application of current sheets to solar-flare theory is reviewed by examining the current-sheet flare models of Syrovatskii (1966), Sturrock (1966 through 1974), Krivsky (1968), and Heyvaerts et al. (1976). Petschek's (1964) model for fast reconnection is placed on a firm mathematical basis and is found to give a maximum reconnection rate of between one tenth and one hundredth of the Alfven speed. It is shown that the hard phase of Syrovatskii's mechanism seems not to work because the electron conduction velocity does not become large enough during current-sheet formation and that Sturrock's model is likely to be invalid when applied to a helmet streamer. The possibility is considered that a helmet configuration could result lower down in the atmosphere from the eruption of a force-free field.
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