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Solar filament eruptions and energetic particle eventsThe 1981 December 5 solar filament eruption that is associated with an energetic (E greater than 50 MeV) particle event observed at 1 AU. The eruption was photographed in H-alpha and was observed by the Solwind whitelight coronagraph on P78-1. It occurred well away from any solar active region and was not associated with an impulsive microwave burst, indicating that magnetic complexity and a detectable impulsive phase are not required for the production of a solar energetic particle (SEP) event. No metric type II or IV emission was observed, but an associated interplanetary type II burst was detected by the low-frequency radio experiment on ISEE 3. The December 5 and two other SEP events lacking evidence for low coronal shocks had unusually steep energy spectra (gamma greater than 3.5). In terms of shock acceleration, this suggests that shocks formed relatively high in the corona may produce steeper energy spectra than those formed at lower altitudes. It is noted that the filament itself maybe one source of the ions accelerated to high energies, since it is the only plausible coronal source of the He(+) ions observed in SEP events.
Document ID
19860045931
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kahler, S. W.
(Emmanuel College Boston, MA, United States)
Cliver, E. W.
(USAF, Geophysics Laboratory, Bedford MA, United States)
Cane, H. V.
(Emmanuel Coll. Boston, MA, United States)
Mcguire, R. E.
(Emmanuel Coll. Boston, MA, United States)
Stone, R. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 302
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
86A30669
Funding Number(s)
CONTRACT_GRANT: NGR-21-002-316
CONTRACT_GRANT: NASA ORDER W-14429
CONTRACT_GRANT: F19628-82-K-0039
Distribution Limits
Public
Copyright
Other

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