Physics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...39..415s&link_type=abstract
Solar Physics, vol. 39, Dec. 1974, p. 415-430.
Physics
13
Atmospheric Heating, Chromosphere, Heat Flux, Particle Acceleration, Solar Flares, Solar Temperature, Conductive Heat Transfer, Energy Spectra, High Energy Electrons, Particle Energy, Radiative Heat Transfer, Solar X-Rays
Scientific paper
Conditions for the formation and characteristics of two classes of optical flares, occurring in the chromosphere in the low-temperature part of a region of nonuniform heating caused by the flare process, are investigated. The first class, thermal flares, occurs when heating is carried out by heat conduction; the second class, 'penetrating' flares, is produced when heating is carried out by accelerated particles penetrating into the low-temperature part of the flare. Thermal flares take place for a soft spectrum of accelerated electrons and a high temperature of the hot (X-ray) flare region. For a hard spectrum and relatively low temperature of a soft X-ray radiation, 'penetrating' optical flares occur. Thermal flares are characterized by rather small depth of the cold region and a small share of optical radiation (less than 1%) in the total flare radiation energy. In penetrating flares, the share of low-temperature optical radiation can reach several tens per cent at a very rigid spectrum of accelerated particles.
Somov Boris V.
Syrovatskiĭ S. I.
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