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Title:
Acceleration of energetic particles by shock waves from large solar flares
Authors:
Reames, Donald V.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. L63-L67. (ApJL Homepage)
Publication Date:
08/1990
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Particle Acceleration, Shock Wave Interaction, Solar Flares, Solar Planetary Interactions, Heavy Elements, Mass Distribution, Solar Protons
DOI:
10.1086/185780
Bibliographic Code:
1990ApJ...358L..63R

Abstract

Time-intensity profiles for solar proton events are analyzed with respect to the acceleration of energetic particles from the ambient solar wind by an interplanetary shock. The time-intensity profiles are derived from the Helio 1 particle data base for 1974 to 1984. It is found that many of the large proton events display a prolonged plateau. The Fe/O abundances in the large proton events are studied. It is observed that initially the Fe/O ratio is high (about 1.0), but after proton intensities increase to about 100 protons/sq cm sr sec MeV the Fe/O ratio decreases to a value near 0.1.

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