期刊
ASTROPHYSICAL JOURNAL
卷 812, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/812/1/68
关键词
acceleration of particles; magnetohydrodynamics (MHD); plasmas; shock waves; solar wind
资金
- NSF grants [AGS-1063439, AGS-1156094]
- NASA [NNX14AI63G, NNX14AC396]
- Solar Probe PLUS/ISIS through SWRI subcontract [D99031L]
- Thailand Research Fund
- Delaware Space Grant College and Fellowship Program (NASA grant) [NNX10AN63H]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1063439, 1156094] Funding Source: National Science Foundation
We present results from an analysis of Advanced Composition Explorer (ACE) observations of energetic particles in the 0.047-4.78 MeV range associated with shocks and discontinuities in the solar wind. Previous work found a strong correlation between coherent structures and energetic particles measured by ACE/EPAM. Coherent structures are identified using the Partial Variance of Increments (PVI) method, which is essentially a normalized vector increment. The correlation was based on a superposed epoch analysis using over 12 years of data. Here, we examine many individual high-PVI events to better understand this association emphasizing intervals selected from data with shock neighborhoods removed. We find that in many cases the local maximum in PVI is in a region of rising or falling energetic particle intensity, which suggests that magnetic discontinuities may act as barriers inhibiting the motion of energetic particles across them.
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