Physics – Plasma Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30m..30g&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 13, pp. 30-1, CiteID 1697, DOI 10.1029/2003GL017079
Physics
Plasma Physics
14
Solar Physics, Astrophysics, And Astronomy: Flares, Space Plasma Physics: Transport Processes, Interplanetary Physics: Energetic Particles, Solar
Scientific paper
More than 280 impulsive solar electron bursts, largely associated with type III radio bursts, have been observed by the solar wind experiment on ACE at energies below 1.4 keV. Here we illustrate some of the characteristics of these events with detailed observations of a particularly intense and long-lasting (>19 hours) event that extended smoothly as a power law in energy down to at least 142 eV. Such low-energy extensions of burst spectra may be evidence that the electrons in these bursts are accelerated at altitudes considerably greater than 1 solar radius above the photosphere. If so, then other characteristics of these events make it appear unlikely that the bursts result from shock acceleration. An alternate possibility is that acceleration actually occurs relatively low in the corona, as would be inferred from observations of type III bursts, and is followed by a more gradual release of electrons to the heliosphere.
Gosling Jack T.
McComas David John
Skoug Ruth M.
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