The distribution of auroral electrostatic shocks below 8000-km altitude

Details The distribution of auroral electrostatic shocks below 8000-km altitude The distribution of auroral electrostatic shocks below 8000-km altitude

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7107b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 7107-7120.

Mathematics

Probability

57

Auroras, Electrostatic Waves, Ion Beams, Satellite Observation, Shock Wave Propagation, Data Bases, Electric Fields, Temporal Distribution

Scientific paper

The distributions and characteristics of electrostatic shocks were investigated based on data gathered by the S3-3 polar-orbiting satellite which realized auroral oval coverage at all magnetic local times and at all altitudes between 240-8000 km. It is determined that the electrostatic shocks are uniformly distributed in magnetic local time, with a slight increase in the probability of occurrence in the cusp region and a decrease in the post-midnight region. The occurrence of shocks is found to increase significantly with altitude up to 5000 km, and at a slower rate above 5000 km altitude, while larger shocks tend to occur above this altitude and between 16-22 hours magnetic local time. Electrostatic shocks were found to occur almost exclusively in or near the latitudes associated with the auroral oval, and low latitude shocks were observed only during periods of high Kp. In addition, a comparison of upward flowing ion beams with electrostatic shocks indicated that energetic ion beams are correlated with shocks while low energy beams are not, which suggests a possible potential threshold for shocks in ion beam regions.

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