Gamma-ray and microwave evidence for two phases of acceleration in solar flares
Relativistic electrons in large solar flares produce gamma ray continuum by bremsstrahlung and microwave emission by gyrosynchrotron radiation. By use of observations of the August 4, 1972, 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 electrons of less than about 100 keV in flares. (auth)
- OSTI ID:
- 7344779
- Report Number(s):
- N-76-20056; NASA-TM-X-71083; X-660-76-58
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
BARYONS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTRA
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GAMMA RADIATION
HADRONS
IONIZING RADIATIONS
LEPTONS
MICROWAVE RADIATION
NUCLEONS
PHYSICAL PROPERTIES
PROTONS
RADIATIONS
RELATIVISTIC RANGE
SOLAR ACTIVITY
SOLAR ELECTRONS
SOLAR FLARES
SOLAR PARTICLES
SOLAR PROTONS
SOLAR RADIATION
SPECTRA
STELLAR RADIATION
TIME DEPENDENCE