Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53b..04h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH53B-04
Physics
7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration, 7846 Plasma Energization
Scientific paper
We have investigated more than 260 3He-rich (3He/4He > 0.004 at 0.2-2.0 MeV/nucleon) solar energetic particle (SEP) events from September 1997 through December 2006 using the ULEIS instrument on ACE. Both "impulsive" (flare-related) and "gradual" (CME-related) events are included. The 3He fluences varied only by a factor of 100 above our instrument sensitivity threshold while the 4He fluences varied by factor of 10,000 above the same threshold. Moreover, there appears to be no significant correlation between the 3He and 4He fluences. We find it striking that with more than 9 years of continuous SEP data, we could not find any SEP event that has a 3He fluence higher than 2.0×105/cm2-sr-MeV/nucleon, while the largest 4He fluence observed was 7.0×107/cm2-sr-MeV/nucleon. In the approximation that the event fluence is proportional to the net particle outflow from the Sun, the observed upper limit for the 3He fluence seems to indicate that only limited outflow of 0.2-2 MeV/nucleon 3He can be released from the Sun in a SEP event.
Ho George C.
Mason Glenn M.
Roelof Edmond C.
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