Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh11b0267w&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH11B-0267
Physics
2114 Energetic Particles (7514), 7514 Energetic Particles (2114)
Scientific paper
Impulsive solar energetic particle (SEP) events are characterized by large excesses of 3He/4He relative to the solar wind value of 0.0005 and a pattern of increasing heavy element abundance enhancement factors with increasing atomic number, Z, or mass, M. Because the heavy-ion energy spectra observed in these events are generally soft, relatively little is known about their elemental and isotopic composition above several MeV/nucleon. However, a few relatively-large 3He-rich SEP events in August 2002 provided statistically-significant samples of nuclei up through Z=30 above 10 MeV/nuc as well as isotopic composition data for several major elements. Heavy element abundances in these event were highly fractionated and not well-ordered by Z or M. In order to investigate how common this sort of fractionation is in impulsive events we have surveyed 8+ years of data from the Solar Isotope Spectrometer on ACE using two different approaches. First, heavy ion abundances were derived for those 3He-rich events in which statistically-significant measurements were possible. And second, data were combined from a large number of 3He-rich time periods in order derive the fluence-weighted composition in such periods. We present and compare composition results obtained using these two approaches and discuss their implications for the origin of impulsive SEP events. This work was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC.
Cohen M. C.
Cummings Alan C.
Leske Richard A.
Mewaldt Richard A.
Stone Edward C.
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