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

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

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29.1021g&link_type=abstract

Planetary and Space Science, vol. 29, Oct. 1981, p. 1021-1060.

Computer Science

Sound

14

Electron Plasma, Geosynchronous Orbits, Ion Distribution, Space Plasmas, Statistical Analysis, Atmospheric Models, Ats 5, Ats 6, Error Analysis, Magnetic Storms, Magnetic Variations, Particle Energy, Satellite Sounding

Scientific paper

Data on the geosynchronous plasma environment between approximately 30 eV and 80 keV are analyzed statistically. Nearly 50 days of 10 minute averages of the first four moments of the distribution function from low-energy plasma detectors on the ATS-5 and ATS-6 geosynchronous satellites were used. The data were studied in terms of occurrence frequency, local time variations, and response to geomagnetic activity. These techniques revealed marked differences in the ATS-5 and ATS-6 data bases. When translated into a 2-Maxwellian representation, it was found that (1) the ATS-6 data covered an energy range not covered by ATS-5 (between 1 and 50 eV) and (2) there was a definite change in the ion plasma between the ATS-5 and ATS-6 measurements. Simple expressions are derived to simulate the relationship between the four moments, and a model is presented, which takes into account the ATS-5 and ATS-6 plasma variations. Despite the differences in the ion data, the accuracy of the four-moment representation was found valid for characterizing the geosynchronous electron population.

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