Energetic 3He in the Inner Heliosphere: 1997 to 2004

Details Energetic 3He in the Inner Heliosphere: 1997 to 2004 Energetic 3He in the Inner Heliosphere: 1997 to 2004

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51a0269w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH51A-0269

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2162 Solar Cycle Variations (7536)

Scientific paper

ACE observations of helium isotopes in solar energetic particles have shown that 3He was present in the interplanetary medium at 1 AU more than half of the time during the early portion of solar cycle 23 (specifically from August 1997 to April 2002). The observed 3He particles, with energies in the range 0.2 to 16 MeV/nuc, are believed to be accelerated in numerous small impulsive solar flare events. The suprathermal ions resulting from such events have been shown to provide a seed population which can be further accelerated by shocks in the solar corona or interplanetary medium. We have extended our previous investigation to include the time interval from early 2002 to late 2004, a period during which solar activity declined significantly. In addition to presenting the time dependence of 3He in the interplanetary medium over a 7-year period, we examine correlations between this energetic particle population and various measures of solar flare activity in order to assess, on a statistical basis, the characteristics of the sources of these particles and to determine the extent to which flare activity can provide a useful indication of the presence of flare suprathermals in the interplanetary medium.

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