Abstract
For the time periods 1979 April 22–May 17 and 1980 May 9–June 10, when the HELIOS spacecraft were located inside 0.5 AU, we compared the antenna temperature T A of the 466 kHz type III bursts measured by the SBH instrument on ISEE 3 with the fluxes of ∼ 0.5 MeV electrons measured by HELIOS. For 51 flare-associated kilometric type III bursts (FAIII bursts) with log(T A) > 10 we find: (1) 25 bursts (49%) are accompanied by a relativistic electron event in interplanetary space, (2) the probability for detection of an electron event decreases from more than 74% inside a cone of ± 20 ° to 56% inside a cone of ± 60° around the flare site, (3) there is only a small correlation between the brightness temperature of the radio burst and the size of the electron event, and (4) despite the broad scatter of these values there is a clear indication that for a given size of the relativistic electron event the intensity of the type III burst is about a factor of 5 higher if it is accompanied by a type II burst. These results give evidence (a) that at least part of the relativistic electrons frequently is accelerated together with non-relativistic electrons and (b) that the coronal shock associated with the metric type II burst has a weaker effect on relativistic than on non-relativistic electrons.
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Now at DFVLR, Oberpfaffenhofen, Germany.
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Hucke, S., Kallenrode, MB. & Wibberenz, G. Interplanetary type III radiobursts and relativistic electrons. Sol Phys 142, 143–155 (1992). https://doi.org/10.1007/BF00156638
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DOI: https://doi.org/10.1007/BF00156638