Interplanetary ions during an energetic storm particle event - The distribution function from solar wind thermal energies to 1.6 MeV

Details Interplanetary ions during an energetic storm particle event - The distribution function from solar wind thermal energies to 1.6 MeV Interplanetary ions during an energetic storm particle event - The distribution function from solar wind thermal energies to 1.6 MeV

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..547g&link_type=abstract

Journal of Geophysical Research, vol. 86, Feb. 1, 1981, p. 547-554. Research sponsored by the U.S. Department of Energy; Bundes

Physics

114

Distribution Functions, Energetic Particles, Interplanetary Gas, Ion Motion, Solar Wind, Thermal Energy, Flux Density, International Sun Earth Explorer 2, International Sun Earth Explorer 3, Particle Acceleration, Shock Waves

Scientific paper

An ion velocity distribution function of the postshock phase of an energetic storm particle (ESP) event is obtained from data from the ISEE 2 and ISEE 3 experiments. The distribution function is roughly isotropic in the solar wind frame from solar wind thermal energies to 1.6 MeV. The ESP event studied (8/27/78) is superposed upon a more energetic particle event which was predominantly field-aligned and which was probably of solar origin. The observations suggest that the ESP population is accelerated directly out of the solar wind thermal population or its quiescent suprathermal tail by a stochastic process associated with shock wave disturbance. The acceleration mechanism is sufficiently efficient so that approximately 1% of the solar wind population is accelerated to suprathermal energies. These suprathermal particles have an energy density of approximately 290 eV cubic centimeters.

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