Publication: Association of suprathermal particles with coherent structures and shocks
Issued Date
2013-10-10
Resource Type
ISSN
20418213
20418205
20418205
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2-s2.0-84884889230
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Mahidol University
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SCOPUS
Bibliographic Citation
Astrophysical Journal Letters. Vol.776, No.1 (2013)
Suggested Citation
J. A. Tessein, W. H. Matthaeus, M. Wan, K. T. Osman, D. Ruffolo, J. Giacalone Association of suprathermal particles with coherent structures and shocks. Astrophysical Journal Letters. Vol.776, No.1 (2013). doi:10.1088/2041-8205/776/1/L8 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/31688
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Title
Association of suprathermal particles with coherent structures and shocks
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. © 2013. The American Astronomical Society. All rights reserved..