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Solar flare nuclear gamma-rays and interplanetary proton eventsGamma-ray line (GRL) and solar energetic proton (SEP) events observed from February 1980 through January 1985 are compared in order to substantiate and better characterize the lack of correlation between GRL fluences and SEP event peak fluxes. The scatter plot of SEP event peak flux vs. GRL fluence is presented, and the ratio of 'solar' to 'interplanetary', about 10 MeV protons, is presented. It is shown that, while even large SEP events can originate in flares lacking detectable GRL emission, the converse case of flares with a significant GRL line fluence by lacking protons in space is rare. The ratio R of the number of about 10 MeV protons that produce GRL emission at the flare site to the number of about 10 MeV protons detected in space can vary from event to event by four orders of magnitude. There is a clear tendency for impulsive flares to have larger values of R than long-duration flares, where the flare time scale is given by the e-folding decay time of the associated soft X-ray emission.
Document ID
19890062865
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cliver, E. W.
(USAF, Geophysics Laboratory, Hanscom AFB MA, United States)
Forrest, D. J.
(New Hampshire, University Durham, United States)
Cane, H. V.
(Air Force Geophysics Lab. Hanscom AFB, MA, United States)
Reames, D. V.
(Air Force Geophysics Lab. Hanscom AFB, MA, United States)
Mcguire, R. E.
(Air Force Geophysics Lab. Hanscom AFB, MA, United States)
Von Rosenvinge, T. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
August 15, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 343
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
89A50236
Funding Number(s)
CONTRACT_GRANT: NAG2-393
CONTRACT_GRANT: NAS5-23761
CONTRACT_GRANT: NGL-05-003-017
CONTRACT_GRANT: NAG5-720
CONTRACT_GRANT: NAS5-28609
CONTRACT_GRANT: NAG5-376
CONTRACT_GRANT: NGR-21-002-316
Distribution Limits
Public
Copyright
Other

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