^3HE Enhancements in Large Solar Energetic Particle Events

Details ^3HE Enhancements in Large Solar Energetic Particle Events ^3HE Enhancements in Large Solar Energetic Particle Events

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...525l.133m&link_type=abstract

The Astrophysical Journal, Volume 525, Issue 2, pp. L133-L136.

Astronomy and Astrophysics

Astronomy

90

Acceleration Of Particles, Ism: Cosmic Rays, Interplanetary Medium, Sun: Solar Wind, Sun: Flares

Scientific paper

We have measured the ^3He abundance from ~0.5 to 2 MeV nucleon^-1 in 12 large solar energetic particle (SEP) events during the period 1997 November-1999 June. In five of the events, the ^3He time-intensity profile is similar to the ^4He time-intensity profile, indicating a common acceleration and transport origin for the two species. The average ^3He/^4He ratio during these events is (1.9+/-0.2)x10^-3, a factor of ~5 enhancement over the solar wind value. During this same survey period, we have also measured the low-energy ion intensities during quieter periods in between the large-particle events. We find ^3He and Fe remnants from impulsive events present on a majority of the days, implying that they fill a substantial volume (>50%) of the in-ecliptic interplanetary medium during our survey. We suggest that these suprathermal ions may therefore be a source population that is available for further acceleration by interplanetary shocks that accompany large SEP events, thereby leading to the ^3He enhancements in a significant fraction of large SEP events. This impulsive SEP event material might also account for recent observations of large solar particle events with energetic particle ionization states that have a wide range of ionization states that encompass values expected for both gradual and impulsive solar SEP events.

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