Physics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph..100..537l&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 100, Oct. 1985, p. 537-561.
Physics
135
High Energy Electrons, Interplanetary Medium, Solar Electrons, Solar Flares, Type 3 Bursts, Angular Distribution, Electron Acceleration, Energy Spectra, Helium, International Sun Earth Explorer 3, Solar Corona, Wave Interaction
Scientific paper
Results are given of ISEE-3 measurements of energetic solar electrons extending down to 2 keV energy. Such measurements have provided a new perspective on energetic solar electrons in the interplanetary medium. Impulsive solar electron events are observed, on the average, several times a day near solar maximum, with about 40 percent detected only below about 15 keV. The electron energy spectra have a nearly power-law shape extending smoothly down to 2 keV, indicating that the origin of these events is high in the corona. In large solar flares which accelerate electrons and ions to relativistic energies, the electron spectrum appears to be modified by a second acceleration which results in a double power-law shape above about 10 keV with a break near 100 keV and flattening from about 10-100 keV. Solar type-III radio bursts are produced by the escaping 2-100 keV electrons through a beam-plasma instability.
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