Computer Science – Sound
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..685d&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 8, p. 685-696.
Computer Science
Sound
46
Ampte (Satellites), Atmospheric Composition, Geosynchronous Orbits, Ion Distribution, Plasma Composition, Satellite Sounding, Ion Charge, Ion Temperature, Plasma Drift
Scientific paper
The paper presents results of a statistical study of average characteristics of the energetic ion population at geosynchronous altitudes, using energetic-ion (1-300 keV/e) measurements from the CHEM spectrometer aboard the AMPTE Charge Composition Explorer between January 1985 and June 1987. Data were sorted into four MLT groups and two extreme geomagnetic activity levels ('very quiet' for AE less than 30 nT and 'very active' for AE greater than 700 nT). A clear quiet-time dayside feature found in the measurements was a dip in H(+) and He(2+) spectra, at 6.6 keV/e in the prenoon sector and at 3.5 keV/e in the postnoon sector. During active times, the ion fluxes increased (except for He(+)), and the O(+) contribution to the total energy density increased dramatically. The pitch angle distributions were normal during quiet times and isotropic or field-aligned during active times.
Daglis Ioannis A.
Sarris Emmanuel T.
Wilken Berend
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