Solar flare nuclear gamma-rays and interplanetary proton events

Details Solar flare nuclear gamma-rays and interplanetary proton events Solar flare nuclear gamma-rays and interplanetary proton events

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..953c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. 953-970. Research supported by USAF.

Astronomy and Astrophysics

Astrophysics

48

Gamma Ray Spectra, Solar Cosmic Rays, Solar Flares, Solar Planetary Interactions, Solar Protons, Gamma Ray Spectrometers, Line Spectra, Particle Acceleration, Solar Maximum Mission

Scientific paper

Gamma-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.

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