Gamma-ray and microwave evidence for two phases of acceleration in solar flares |
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| Authors: | T Bai R Ramaty |
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| Institution: | (1) Department of Physics and Astronomy, University of Maryland, 20742 College Park, Maryland, U.S.A.;(2) Goddard Space Flight Center, 20771 Greenbelt, Maryland, U.S.A. |
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| Abstract: | 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, we evaluate in detail the electron spectrum and the physical properties (density, magnetic field, size, and temperature) of the common emitting region of these radiations. We also obtain information 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, we conclude that in large solar flares relativistic electrons and energetic nuclei are accelerated by a mechanism which is different from the mechanism which accelerates  100 keV electrons in flares.Research supported by NASA Grant 21-002-316 at the University of Maryland, College Park. |
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