期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 776, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/776/1/L8
关键词
acceleration of particles; magnetohydrodynamics (MHD); plasmas; shock waves; solar wind
资金
- NSF SHINE [(AGS-1156094]
- Solar Terrestrial [AGS-1063439]
- NASA through the Magnetosphere Multiscale Mission Theory and Modeling program [NNX08AT76G]
- University of Calabria
- Thailand Research Fund
- UK STFC
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1063439] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1156094] Funding Source: National Science Foundation
- NASA [NNX08AT76G, 94698] Funding Source: Federal RePORTER
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.
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