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Title: Association of suprathermal particles with coherent structures and shocks
Authors: J. A. Tessein
W. H. Matthaeus
M. Wan
K. T. Osman
D. Ruffolo
J. Giacalone
University of Delaware
The University of Warwick
Mahidol University
South Carolina Commission on Higher Education
University of Arizona
Keywords: Earth and Planetary Sciences;Physics and Astronomy
Issue Date: 10-Oct-2013
Citation: Astrophysical Journal Letters. Vol.776, No.1 (2013)
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..
ISSN: 20418213
Appears in Collections:Scopus 2011-2015

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