Energetic electrons in impulsive and extended solar flares as deduced from flux correlations between hard X-rays and microwaves

Details Energetic electrons in impulsive and extended solar flares as deduced from flux correlations between hard X-rays and microwaves Energetic electrons in impulsive and extended solar flares as deduced from flux correlations between hard X-rays and microwaves

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324.1118k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 1118-1131.

Astronomy and Astrophysics

Astrophysics

95

Coronal Loops, Energetic Particles, Microwaves, Solar Flares, Solar Flux, Solar X-Rays, Bremsstrahlung, Bursts, Particle Acceleration, X Ray Spectra

Scientific paper

The peak flux relationship between hard X-rays and microwaves from solar flares is studied using about 400 events simultaneously recorded with the hard X-ray burst spectrometer on the SMM satellite and the Nobeyama 17 GHz radiometer. The data indicate that the hard X-ray and microwave peak fluxes correlate best for X-ray energies of less than about 80 keV for impulsive flares and greater than about 360 keV for extended flares. By postulating that electrons responsible for microwave emission at 17 GHz are those emitting hard X-rays at these photon energies, it is concluded that: (1) in impulsive flares, microwaves at about 20 GHz are emitted mainly by electrons of less than about 200 keV from a layer through which the electrons stream down into the thick-target hard X-ray source; and (2) in extended flares, microwaves are emitted mainly by MeV electrons trapped in a coronal loop or loops.

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