COROTATING INTERACTION REGION ASSOCIATED SUPRATHERMAL HELIUM ION ENHANCEMENTS AT 1 AU: EVIDENCE FOR LOCAL ACCELERATION AT THE COMPRESSION REGION TRAILING EDGE

We examined the temporal profiles and peak intensities for 73 corotating interaction region (CIR)-associated suprathermal (~0.1-8 MeV nucleon super(-1)) helium (He) ion enhancements identified at STEREO-A, STEREO-B, and/or Advanced Composition Explorer between 2007 and 2010. We found that in most ev...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2012-04, Vol.749 (1), p.1-13
Main Authors: EBERT, R. W, DAYEH, M. A, DESAI, M. I, MASON, G. M
Format: Article
Language:English
Subjects:
ACCELERATION
Advanced Composition Explorer
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Compressing
COMPRESSION RATIO
Correlation
Earth orbital environments
Earth, ocean, space
Energetic particles
Exact sciences and technology
HELIUM
MAGNETIC COMPRESSION
ORBITS
PLASMA
SHOCK WAVES
SOLAR SYSTEM
SOLAR SYSTEM EVOLUTION
Temporal logic
Trailing edges
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We examined the temporal profiles and peak intensities for 73 corotating interaction region (CIR)-associated suprathermal (~0.1-8 MeV nucleon super(-1)) helium (He) ion enhancements identified at STEREO-A, STEREO-B, and/or Advanced Composition Explorer between 2007 and 2010. We found that in most events the peak He intensity times were well organized by the CIR compression region trailing edge, regardless of whether or not a reverse shock was present. Out of these events, 19% had their 0.193 MeV nucleon super(-1) He intensities peak within 1 hr and 50% within 4.75 hr of the CIR trailing edge, the distribution having a 1[sigma] value of 7.3 hr. Events with a 0.193 MeV nucleon super(-1) He intensity peak time within 1[sigma] of the CIR trailing edge showed a positive correlation between the ~0.1 and 0.8 MeV nucleon super(-1) He peak intensities and magnetic compression ratios in events both with and without a reverse shock. The peak intensities in all other events showed little to moderate correlation between these parameters. Our results provide evidence that some fraction of the CIR-associated
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637x/749/1/73