The energy spectrum of 35- to 1600-keV protons associated with interplanetary shocks

Details The energy spectrum of 35- to 1600-keV protons associated with interplanetary shocks The energy spectrum of 35- to 1600-keV protons associated with interplanetary shocks

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2122v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, April 1, 1984, p. 2122-2132.

Physics

87

Energy Spectra, Interplanetary Space, Proton Energy, Shock Waves, Solar Protons, Diffusion Theory, International Sun Earth Explorer 3, Particle Acceleration, Power Spectra, Proton Flux Density, Spectrum Analysis

Scientific paper

Data obtained by the low energy proton experiment on ISEE 3 are the basis of a statistical study on the 35-1600 keV proton energy range spectra taken over the one-hour interval that is centered on the time of arrival of a shock front, for 75 interplanetary shocks covering the August 1978-December 1980 period. Strong and fast oblique shocks are found to be the most effective particle accelerators. The spectrum at the shock can generally be described by two power laws, with a breakpoint energy near 250 keV. For 15 percent of the events, the spectrum followed a power law over the full energy range. It is noted that the low energy spectral index, measured just downstream of shocks associated with clear flux enhancements, is related to the shock strength according to predictions from first-order Fermi acceleration. This is the case irrespective of the assigned diffusive or drift character of the event.

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