Electron acceleration in the corona

George Simnett

Research output: Contribution to journalArticle

9 Citations (Scopus)


The series of nine impulsive, highly collimated beams of near-relativistic electrons seen by ACE/EPAM on 26 and 27 June 2004 occurred at a quiet time with respect to solar flare and CME production. However, they were accompanied by decametric type III radio bursts observed by WIND/WAVES, which had progressively higher starting frequencies, suggestive of coronal acceleration. There were no CMEs seen by SOHO/LASCO in association with any of the type III bursts except possibly the first. The energy spectrum of the electrons was soft, typically E-4.5 but extended up to at least similar to 200 keV. We suggest that the source region for these events is in the high corona. We discuss this result in the context of solar electron acceleration at other times.
Original languageEnglish
Pages (from-to)213-226
Number of pages14
JournalSolar Physics
Publication statusPublished - 1 Jul 2005


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