Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 754, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/754/2/L30
Keywords
acceleration of particles; interplanetary medium; shock waves; Sun: heliosphere
Categories
Funding
- NSF [ATM-0550960, ATM-0551127, 0962653]
- NASA [NNG05GM88G, NNG05GQ94G, NNX07AC12G, NNX07AG85G, NNX07AP69G, NNX07AC15G, NNX08AK87G, 44A-1088526]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0962666, 0962653] Funding Source: National Science Foundation
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We investigated the first-order flow anisotropies in the solar wind frame of similar to 0.06-0.95 MeV nucleon(-1) He ions during three corotating interaction region (CIR)-associated particle intensity enhancements observed at 1 AU by Wind, examining CIRs with (1) a reverse shock, (2) a well-formed compression region, and (3) a weak compression region. We identified anti-sunward flows in the compression region downstream of the CIR trailing edge in the events with a reverse shock and well-formed compression that transitioned to sunward flows across and upstream of this boundary. These observations suggest that the trailing edge is organizing the He ion flows and is a local source for the particles in these events, this source being inside 1 AU prior to the trailing edge arrival and beyond 1 AU after its passage. The event with the weak compression region had predominantly sunward flows throughout, indicating that the source of the He ions was beyond 1 AU. These observations provide compelling evidence that He ions at 1 AU can be accelerated to suprathermal energies at the CIR trailing edge in events where the compression region is well formed.
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