Observations of a high-energy ion shock spike in interplanetary space

Details Observations of a high-energy ion shock spike in interplanetary space Observations of a high-energy ion shock spike in interplanetary space

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..133s&link_type=abstract

Geophysical Research Letters, vol. 3, Mar. 1976, p. 133-136.

Physics

8

Interplanetary Space, Particle Acceleration, Shock Fronts, Solar Wind, Alpha Particles, Charged Particles, Explorer Satellites, Ion Motion, Solar Protons

Scientific paper

Observations are reported of a high-energy ion shock spike extending in energy to more than 25 MeV for protons, more than 4.3 MeV/nuc for alpha particles, and more than 1.6 MeV/nuc for medium nuclei with Z of at least 6. The measurements were obtained in the course of a solar-particle event on September 15, 1975, by the IMP-7 and IMP-8 spacecraft. It is shown that the observations can be reasonably accounted for by intensive acceleration of charged particles at an 'almost' perpendicular interplanetary shock wave. The data are inconsistent with a one-step d.c.-type acceleration process.

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