Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icrc....3..319r&link_type=abstract
IN: International Cosmic Ray Conference, 22nd, Dublin, Republic of Ireland, Aug. 11-23, 1991, Laboratory for High Energy Astroph
Physics
Abundance, Helium Isotopes, International Sun Earth Explorer 3, Satellite Observation, Solar Cosmic Rays, Solar Flares, Annual Variations, Solar Cycles, Solar Physics
Scientific paper
The results of a survey of over 228 (He-3)-rich events, with He-3/H-4 of more than 0.1, observed by the ISEE-3 spacecraft from 1978 August through 1991 April. In these events the elements above C are enhanced relative to the corresponding abundances in the corona and the degree of enhancement increases with Z or A. The flare-to-flare variations in abundances are different in character from those seen in large proton events. For example, using Fe/C as a parameter to describe these variations, the slope of the least-squares fits to ln(X/C) vs ln(Fe/C), where X is the intensity of N, O, Ne, Mg, Si, or S. Slopes of these abundance-correlation lines are much steeper for the (He-3)-rich events than for a sample of 36 large proton events, especially for Ne and heavier ions. The event-to-event variations for the (He-3)-rich events distinguish 3 groups of elements, He-O, Ne-S, and Fe. The abundances of all of the species within each group seem to vary in unison.
Cane Hilary V.
Meyer Jean-Paul
Reames Donald. V.
von Rosenvinge Tycho T.
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