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

摘要: Relativistic electrons in large solar flares produce gamma-ray continuum by bremsstrahlung and microwave emission gyrosynchrotron radiation. Using observations of the 1972, August 4 flare, we evaluate detail electron spectrum physical properties (density, magnetic field, size, temperature) common emitting region these radiations. We also obtain information on energetic protons this flare using lines. From spectrum, proton-to-electron ratio, time dependences emission, 2.2 MeV line continuum, conclude that relativistic nuclei are accelerated a mechanism which is different from accelerates ≲ 100 keV flares.