Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..107w&link_type=abstract
ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V
Other
5
Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays
Scientific paper
Observations of a number of relatively large solar energetic particle (SEP) events that have occurred since the launch of ACE in August 1997 have shown that the ratio of 3He/4He can be enhanced over the solar wind value (~4×10-4) by more than an order of magnitude in such events. Since particle acceleration in these ``gradual'' SEP events is thought to be caused by CME-driven shocks traveling through the solar corona and interplanetary medium, a source of 3He in addition to the solar wind appears required to provide the seed material. Using data from the Solar Isotope Spectrometer on ACE, we have carried out a more detailed investigation of the characteristics of the 3He enhancements at energies >5 MeV/nucleon in three large SEP events (4 Nov 1997, 6 May 1998, and 14 Nov 1998). We find that the 3He/4He ratios are essentially time-independent during the events, that the 3He energy spectra are markedly harder than those commonly observed in impulsive events, and that the spectra of 3He may be harder than those of 4He. .
Christian Eric R.
Cohen Christina Mae S.
Cummings Alan C.
Leske Richard A.
Mewaldt Richard A.
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