Acceleration of energetic protons by interplanetary shocks

Details Acceleration of energetic protons by interplanetary shocks Acceleration of energetic protons by interplanetary shocks

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7297p&link_type=abstract

Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7297-7301.

Physics

8

Energetic Particles, Interplanetary Medium, Particle Acceleration, Protons, Shock Wave Propagation, Jupiter (Planet), Pioneer 11 Space Probe, Pitch (Inclination), Planetary Radiation, Shock Fronts

Scientific paper

The University of Iowa instrument aboard Pioneer 11 detected 69 energetic proton events (EPE) (in the 0.6-3.4 MeV energy range) during 1973-1974 in the heliocentric radial range 1-5 AU. Sixty percent of the EPE peak within plus or minus 5 hours of a corotating interaction region (CIR) boundary, while 19% peak inside and 21% peak outside the interaction regions. Of the CIR boundaries at which an EPE peaks with plus or minus 5 hours, 80% have associated shocks. The observed intensities and pitch angle distributions of protons near shock fronts are consistent with a theoretical simulation of the acceleration of protons by a drift in the electric field at the shock front.

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