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The energy spectrum of 20 keV-20 MeV electrons accelerated in large solar flares
Lin, R. P.; Mewaldt, R. A.; Van Hollebeke, M. A. I.
AA(California, University, Berkeley, CA), AB(California Institute of Technology, Pasadena, CA), AC(NASA, Goddard Space Flight Center, Greenbelt, MD)
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 949-962. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Electron Acceleration, Energy Spectra, Solar Flares, Solar Spectrometers, Explorer 43 Satellite, Explorer 47 Satellite, Explorer 50 Satellite, Propagation Velocity, Radiant Flux Density, Shock Wave Propagation, Solar Longitude, Solar Spectra, Solar X-Rays, Spectral Energy Distribution
Bibliographic Code:


IMP 6, 7, and 8 measurements of the energy spectrum of 20 keV to 20 MeV electrons observed from large solar flares are presented. To minimize propagation effects, only events from flares at W30 deg to W90 deg solar longitude are considered. The energy spectra are constructed using the maximum flux observed at each energy. It is shown that these spectra are representative of the spectra of the electrons escaping from the sun over this range of energies. It is found that every event shows the same spectral shape: a double power law with a smooth transition around 100-200 keV and power law exponents of 0.6-2.0 below and 2.4-4.3 above. The more intense the event, the harder the observed spectrum; in certain cases, the spectra are observed to steepen above 3 MeV.

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