Application of the trap-plus-precipitation hard X-ray burst model to the flare of August 4, 1972

Details Application of the trap-plus-precipitation hard X-ray burst model to the flare of August 4, 1972 Application of the trap-plus-precipitation hard X-ray burst model to the flare of August 4, 1972

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63..175e&link_type=abstract

Solar Physics, vol. 63, Aug. 1979, p. 175-185.

Physics

5

Electron Precipitation, Magnetically Trapped Particles, Particle Acceleration, Solar Flares, Solar X-Rays, X Ray Spectra, Electron Energy, Electron Sources, Nonthermal Radiation, Scintillation Counters, Solar Physics

Scientific paper

The theory of Melrose and Brown (1976) concerning the X-ray spectrum resulting from combined precipitation and in-trap acceleration of nonthermal electrons is applied to a large solar flare on the basis of high-time-resolution hard X-ray data. The time behavior of the electron source function is inferred as a function of energy and mean ambient trap density. The results are interpreted in the context of a purely thick-target model, a static trap with continuous injection of fresh electrons, and a dynamic trap with continuous redistribution of electron energies. It is concluded that: (1) a minimum trap density exists below which the static-trap description cannot be valid; (2) a mean ambient trap density less than the cited minimum is possible if a dynamic trap is invoked; and (3) the electron source function at a given instant in such low-density dynamic traps may bear little or no resemblance to a power-law spectrum despite its production, via nonthermal bremsstrahlung, of a power-law X-ray spectrum.

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