CIR-Associated Suprathermal Helium Ion Enhancements at 1 AU: Evidence of Local Acceleration at the Compression Region Boundary

Details CIR-Associated Suprathermal Helium Ion Enhancements at 1 AU: Evidence of Local Acceleration at the Compression Region Boundary CIR-Associated Suprathermal Helium Ion Enhancements at 1 AU: Evidence of Local Acceleration at the Compression Region Boundary

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33a2037e&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH33A-2037

Physics

Plasma Physics

[2102] Interplanetary Physics / Corotating Streams, [2114] Interplanetary Physics / Energetic Particles, [7845] Space Plasma Physics / Particle Acceleration

Scientific paper

We surveyed 74 CIR-associated suprathermal (~0.1 - 8 MeV/n) helium (He) ion enhancements identified at ACE, STEREO-A or STEREO-B between 2007 and 2010. These events were selected on the basis of enhancements in the <1 MeV/n He ion intensities that were associated with well-defined CIR compression regions. We found that the peak He intensity arrival times were well organized by the trailing edge of the compression regions, ~20% of the events having He intensities that peaked within 1 hr. of this boundary. Events with an intensity peak and/or a shock at the CIR trailing edge (~40% of the events) had, on average, stronger compressions and showed good correlation between peak He intensities and the compression ratios at the reverse boundary. Specifically, the peak He intensities and magnetic compression ratios showed a consistently strong correlation up to ~0.8 MeV/n that remained significant to ~1.5 MeV/n. Events with no shock or intensity peak at the reverse boundary had, on average, weaker compression ratios and did not show any correlation with the local solar wind parameters. We interpret these results as evidence that in cases of strong compression the local solar parameters are capable of driving suprathermal ion enhancements at the CIR reverse boundary at 1 AU.

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