Dependence of 50-keV upstream ion events at IMP 7 and 8 upon magnetic field bow shock geometry

Details Dependence of 50-keV upstream ion events at IMP 7 and 8 upon magnetic field bow shock geometry Dependence of 50-keV upstream ion events at IMP 7 and 8 upon magnetic field bow shock geometry

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5623m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5623-5634.

Mathematics

Probability

36

Bow Waves, Explorer 47 Satellite, Explorer 50 Satellite, Shock Waves, Solar Terrestrial Interactions, Interplanetary Magnetic Fields, Solar Wind, Statistical Analysis

Scientific paper

Results are presented for a statistical study of four years (1972-1976) of IMP 7 and 8 observations at approximately 40 R(E) of 50-200 keV upstream ion events measured with the Energetic Particle Experiment. A monotonic increase in the probability of observing upstream particle events is found with a decrease in the angle (theta-Bn) between the interplanetary magnetic field (IMF) and the local shock normal at the point where the IMF intersects the bow shock, independent of the length of time of bow shock connections exceeding approximately 10 min. Approximately equal probabilities are found for observing an event above a given flux from any portion of the bow shock with the same value of theta-Bn, a growth time of the 50-200 keV events of approximately 10 min, a maximum attainable flux of approximately 25,000/sq cm s sr, and a positive correlation between the probability of exceeding a given flux and the 3 hr Kp index. It is concluded that the local structure of the bow shock in the immediate vicinity of the field line connection is the dominant influence in the generation process of energetic upstream particle events and that wave-particle interactions produce a self-throttling mechanism that limits the maximum flux of ions escaping the upstream foreshock.

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