Downstream energetic proton and alpha particles during quasi-parallel interplanetary shock events

Details Downstream energetic proton and alpha particles during quasi-parallel interplanetary shock events Downstream energetic proton and alpha particles during quasi-parallel interplanetary shock events

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7225t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7225-7243.

Physics

16

Alpha Particles, Interplanetary Space, Magnetic Field Configurations, Proton Energy, Shock Waves, Solar Wind Velocity, Energetic Particles, Energy Methods, International Sun Earth Explorers, Ion Accelerators

Scientific paper

This paper considers the energetic particle populations in the downstream region of three quasi-parallel interplanetary shock events, which was explored using the ISEE 3 Ultra Low Energy Charge Analyzer sensor, which unambiguously identifies protons and alpha particles using the electrostatic deflection versus residual energy technique. The downstream particles were found to exhibit anisotropies due largely to convection in the solar wind. The spectral indices of the proton and the alpha-particle distribution functions were found to be remarkably constant during the downstream period, being generally insensitive to changes in particle flux levels, magnetic field direction, and solar wind densities. In two of the three events, the proton and the alpha spectra were the same throughout the entire downstream period, supporting the prediction of diffusive shock acceleration theory.

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