Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..366d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 2, Feb. 1987, p. 366-374.
Astronomy and Astrophysics
Astrophysics
51
Electron Energy, Electrostatic Waves, Plasma-Particle Interactions, Solar Radio Bursts, Type 3 Bursts, International Sun Earth Explorers
Scientific paper
Evidence is presented that solar type III radio bursts at kilometric wavelengths are excited by electrons with average speeds of 0.14 c; i.e., in good agreement with in situ measurements by Lin et al. (1981; 1986), but considerably lower than the generally accepted values of 0.3 to 0.5 c. A set of 28 bursts for which electrons and/or plasma waves were observed at ISEE-3 is examined, and it is found that the initial parts of all bursts were due to plasma radiation at the fundamental, and that the fastest electrons that produce radio emission range from 0.25 c down to 0.07 c (average 0.14 c). The slower electrons, those that produce fundamental radiation at approximately the time of burst peak, have an average speed of 0.06 c and a range from about 0.10 c down to 0.03 c.There is no evidence in the data for a systematic increase or decrease of exciting electron speed with distance from the sun.
Dulk George A.
Goldman Martin V.
Hoang Sang
Steinberg Jean-Louis
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