Non-thermal processes during the 'build-up' phase of solar flares and in absence of flares

Details Non-thermal processes during the 'build-up' phase of solar flares and in absence of flares Non-thermal processes during the 'build-up' phase of solar flares and in absence of flares

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47..293k&link_type=abstract

(NASA, IAU, IUGG, and International Council of Scientific Unions, Workshop on Flare Build-up Study, Falmouth, Mass., Sept. 8-11,

Astronomy and Astrophysics

Astronomy

16

Electron Energy, Radio Astronomy, Solar Electrons, Solar Flares, Solar X-Rays, Spaceborne Astronomy, H Alpha Line, Ogo-5, Particle Energy, Radiant Flux Density, Type 3 Bursts, X Ray Astronomy

Scientific paper

Hard X-ray and radio observations indicate production of non-thermal electrons as a common phenomenon of the active sun. A preliminary analysis of three hard X-ray bursts observed with the OGO-5 satellite and radio observations indicate that non-thermal particles are present in the flare region prior to the impulsive (flash) phase and also during the gradual rise and fall (GRF) bursts which are usually explained in terms of purely 'thermal' radiation. The principal difference between the non-thermal electrons observed before the flash phase and during the flash phase appears to be in their total number rather than in the hardness of their energy spectrum. Basic characteristics of the two acceleration processes are probably similar although the total energy converted into non-thermal electrons is considerably larger in the flash phase. Transient absorbing H-alpha features and filament activations are discussed in terms of their ability to produce energetic particle events and magnetic energy release.

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