SEP Fe Charge States in 3He-Rich Interplanetary Shock Events

Details SEP Fe Charge States in 3He-Rich Interplanetary Shock Events SEP Fe Charge States in 3He-Rich Interplanetary Shock Events

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12c..03p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12C-03

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7513 Coronal Mass Ejections, 7514 Energetic Particles (2114)

Scientific paper

3He/4He enhancements have been detected with the ACE/ULEIS instrument in several interplanetary shock events. These enhancements have been interpreted by Desai et al (2001) as reaccelerated suprathermal ions originally accelerated in flare events at the Sun. Another signature of flare-associated ions is highly ionized Fe. The ionic charge state of Fe at approximately 0.25 MeV/nuc has been measured for these events by the ACE/SEPICA instrument. An initial study of eight of the events showed a tendency for high charge state Fe (Q>12+) to be enhanced when the 3He/4He ratio was highest. This result is consistent with the Desai (2001) interpretation. This work extends the initial study to the entire set of 3He-enriched events selected by Desai et al (2001). In addition to a suprathermal ion source for these solar energetic particles, the possible role of CME-type solar wind will also be discussed.

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