A statistical analysis of the low-energy geosynchronous plasma environment-II. Ions

Details A statistical analysis of the low-energy geosynchronous plasma environment-II. Ions A statistical analysis of the low-energy geosynchronous plasma environment-II. Ions

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29.1045g&link_type=abstract

Planetary and Space Science, Volume 29, Issue 10, p. 1045-1060.

Computer Science

16

Scientific paper

This is the second of two papers which together provide a detailed statistical analysis of the low-energy (1-eV-100-keV) geosynchronous plasma environment. In this paper, data on the ion environment between ~1 eV and 80 keV are statistically analysed. About 50 days of 10-min averages of the first 4 moments of the ion distribution function from the University of California at San Diego low-energy plasma detectors on the ATS-5 and ATS-6 geosynchronous satellites are studied in terms of: occurrence frequency, local time variations, Kp variations, injection events, and intercomparisons among the 4 moments. Variations in the 4 moments can be explained by assuming the existence of 2 dominant plasma populations (the plasmasphere and ring current) upon which are superimposed plasma injection events. In conjunction with this analysis, the accuracy of the 4-moment representation for ions was tested and, unlike that for electrons, found to be limited by the energy band-pass of the instrumentation and by a lack of knowledge of the angular anisotropies and ionic composition. Even so, these limitations are outweighed by the utility and compactness of the method. A technique for correcting the limited energy band-pass of the instrumentation is presented in the Appendix.

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