Electron plasma oscillations associated with type III radio emissions and solar electrons

Details Electron plasma oscillations associated with type III radio emissions and solar electrons Electron plasma oscillations associated with type III radio emissions and solar electrons

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..477g&link_type=abstract

Solar Physics, vol. 45, Dec. 1975, p. 477-493. Navy-supported research;

Physics

39

Electron Plasma, Plasma Oscillations, Solar Electrons, Type 3 Bursts, Bow Waves, Explorer Satellites, Plasma Flux Measurement, Shock Waves, Solar Wind

Scientific paper

Results of an extensive search for electron plasma oscillations associated with type III radio noise bursts are presented which were obtained by analyzing 87 type III bursts detected in plasma-wave and charged-particle measurements carried out by IMP 6, 7, and 8. Only one case is found for which plasma oscillations were associated with electrons of solar origin; at least eight events are identified in which no plasma oscillations were detected even though electrons from solar flares were clearly evident. The type III emissions are compared with similar radiation coming from upstream of earth's bow shock at the harmonic of the local electron plasma frequency, and quantitative calculations of the rate of conversion from plasma oscillatory energy to electromagnetic radiation are performed. The results show that electron plasma oscillations are seldom observed in association with solar electron events and type III radio bursts at 1.0 AU and that neither the type III emissions nor the radiation from upstream of the bow shock can be adequately explained by a current model for the coupling of electron plasma oscillations to electromagnetic radiation. Several possible explanations are considered for this discrepancy between theory and observations.

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