Gamma-ray and microwave evidence for two phases of acceleration in solar flares

Details Gamma-ray and microwave evidence for two phases of acceleration in solar flares Gamma-ray and microwave evidence for two phases of acceleration in solar flares

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976stin...7620056b&link_type=abstract

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Physics

Gamma Rays, Microwaves, Particle Acceleration, Solar Flares, Physical Properties, Radiation Spectra, Solar Electrons

Scientific paper

Relativistic electrons in large solar flares produce gamma ray continuum by bremsstrahlung and microwave emission by gyrosynchrotron radiation. Using observations of the 1972, August 4 flare, the electron spectrum and the physical properties of the common emitting region of these radiations were evaluated. Information was also obtained on energetic protons in this flare by using gamma ray lines. From the electron spectrum, the proton-to-electron ratio, and the time dependences of the microwave emission, the 2.2 MeV line and the gamma ray continuum, it was concluded that in large solar flares relativistic electrons and energetic nuclei are accelerated by a mechanism which is different from the mechanism which accelerates approximately less than 100 keV electrons in flares.

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