Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..259r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 1, 1990, p. 259-270.
Astronomy and Astrophysics
Astrophysics
54
Energetic Particles, Radio Emission, Solar Electrons, Solar Flares, Solar Radiation, Abundance, Helium Isotopes, International Sun Earth Explorers, Solar Corona
Scientific paper
The results of a comprehensive search of the ISEE 3 energetic particle data for solar electron events with associated increases in elements with atomic number Z = 6 or greater are reported. A sample of 90 such events was obtained. The events support earlier evidence of a bimodal distribution in Fe/O or, more clearly, in Fe/C. Most of the electron events belong to the group that is Fe-rich in comparison with the coronal abundance. The Fe-rich events are frequently also He-3-rich and are associated with type III and type V radio bursts and impulsive solar flares. Fe-poor events are associated with type IV bursts and with interplanetary shocks. With some exceptions, event-to-event enhancements in the heavier elements vary smoothly with Z and with Fe/C. In fact, these variations extend across the full range of events despite inferred differences in acceleration mechanism. The origin of source material in all events appears to be coronal and not photospheric.
Cane Hilary V.
Reames Donald. V.
von Rosenvinge Tycho T.
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