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Association of surprathermal particles with coherent structures and shocks
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Tessein, J. A., Matthaeus, W. H., Wan, M., Osman, K. T., Ruffolo, D and Giacalone, J. (2013) Association of surprathermal particles with coherent structures and shocks. The Astrophysical Journal, Volume 776 (Number 1). Article number L8. doi:10.1088/2041-8205/776/1/L8 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/2041-8205/776/1/L8
Abstract
Various mechanisms have been proposed to explain observed suprathermal particle populations in the solar wind, including direct acceleration at flares, stochastic acceleration, shock acceleration, and acceleration by random compression or reconnection sites. Using magnetic field and suprathermal particle data from the Advanced Composition Explorer (ACE), we identify coherent structures and interplanetary shocks, and analyze the temporal association of energetic particle fluxes with these coherent structures. Coherent structures having a range of intensities are identified using the magnetic Partial Variance of Increments statistic, essentially a normalized vector increment. A stronger association of energetic particle flux in the 0.047-4.75 MeV range is found with intense magnetic discontinuities than is found with shocks. Nevertheless, the average profile of suprathermals near shocks is quite consistent with standard models of diffusive shock acceleration, while a significant amount of the energetic particles measured and strong discontinuities are found by ACE within six hours of a shock. This evidence supports the view that multiple mechanisms contribute to the acceleration and transport of interplanetary suprathermal particles.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | The Astrophysical Journal | ||||
Publisher: | Institute of Physics Publishing, Inc. | ||||
ISSN: | 0004-637X | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 776 | ||||
Number: | Number 1 | ||||
Page Range: | Article number L8 | ||||
DOI: | 10.1088/2041-8205/776/1/L8 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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