Computer Science
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sfde.nasar....l&link_type=abstract
In its A Study of the Formation and Dynamics of the Earth's Plasma Sheet Using Ion Composition Data 12 p (SEE N94-30126 08-75)
Computer Science
Current Sheets, Feedback, Geomagnetism, International Sun Earth Explorer 1, Ions, Planetary Magnetotails, Solar Cycles, Solar Terrestrial Interactions, Inner Radiation Belt, Ion Density (Concentration), Mass Spectrometers, Plasma Layers, Solar Activity Effects, Statistical Correlation
Scientific paper
Data from energetic ion mass spectrometers on the ISEE 1 and AMPTE/CCE spacecraft are combined with geomagnetic and solar indices to investigate, in a statistical fashion, whether energized O(+) ions of terrestrial origin constitute a source of feedback which triggers or amplifies geomagnetic activity as has been suggested in the literature, by contributing a destabilizing mass increase in the magnetotail current sheet. The ISEE 1 data (0.1-16 keV/e) provide in situ observations of the O(+) concentration in the central plasma sheet, inside of 23 R(sub E), during the rising and maximum phases of solar cycle 21, as well as inner magnetosphere data from same period. The CCE data (0.1-17 keV/e) taken during the subsequent solar minimum all within 9 R(sub E). provide a reference for long-term variations in the magnetosphere O(+) content. Statistical correlations between the ion data and the indices, and between different indices. all point in the same direction: there is probably no feedback specific to the O(+) ions, in spite of the fact that they often contribute most of the ion mass density in the tail current sheet.
Klumpar D. M.
Lennartsson O. W.
Quinn John M.
Shelley Edward G.
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