Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..120...79v&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 120, no. 1, 1989, p. 79-92.
Physics
13
Current Sheets, Solar Flares, Solar X-Rays, Magnetohydrodynamic Waves, Plasma Turbulence, Shock Waves
Scientific paper
The properties and development of a high-temperature current sheet characterized by increasing merging velocity are studied and related to the early phases of solar flares. It is shown that the system can be described by the Petschek-type geometry for a wide range of merging velocities. In the diffusion region and the standing MHD shocks, a low-frequency plasma microturbulence is generated from the very beginning of the reconnection process. The increasing merging velocity leads to the appearance of the soft X-ray precursor. In the Petschek regime the temperature of the hot plasma decreases due to the decrease of the magnetic field strength at the diffusion region boundary, while the soft X-ray radiation still increases, reaching precursor maximum for merging velocities about one percent of the external Alfven velocity. It is shown that Alfven velocities of 800-1200 km/s are sufficient to explain the typical soft X-ray precursors.
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