Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..aprw16015s&link_type=abstract
American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #W16.015
Physics
Scientific paper
Mason et al. have proposed that residual material from preceding impulsive solar energetic particle (SEP) events may provide a source population for the larger gradual events accelerated by CME-driven shocks. This suggests that there may be impulsive SEP material left in interplanetary space during periods relatively free of solar activity. To test this idea we have studied the heavy nuclei present near Earth during periods of low to moderate solar activity between the larger SEP events. Using the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE), we have measured the energy spectra of heavy (Z>=6) elements over the range ~8-20 MeV/nucleon from selected time periods over the last 2.4 years. In these energy spectra, we have looked for spectral and compositional signatures typically characteristic of impulsive or gradual SEP events. We discuss the implications of these observations for the origin of particles accelerated in gradual SEP events. This research was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC.
Christian Eric R.
Cohen Christina Mae S.
Cummings Alan C.
Leske Richard A.
Mewaldt Richard A.
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