Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3600l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3600-3610.
Physics
43
Atmospheric Composition, Energetic Particles, Magnetospheric Ion Density, Solar Terrestrial Interactions, Centimeter Waves, Equatorial Atmosphere, International Sun Earth Explorer 1, Plasma Composition, Positive Ions
Scientific paper
The effects of varying solar activity (as measured by the daily F10.7 index) on the composition of energetic magnetospheric ions H(+), He(2+), He(+), and O(+) were investigated using data obtained in the near-equatorial magnetosphere, between L = 3 and R = 23 earth radii, by the Plasma Composition Experiment on ISEE-1. The strongest effect was found in the number densities of the He(+) and the O(+) ions, which were found to increase by factors of about 3-5 and 5-10, respectively, over the full range of the F10.7. The peak density of the O(+) is about 20 times that of He(+) and is the highest at L of about 3-5. Both species showed a decreasing energy with increasing F10.7 at a radius less than 10 earth radii, from about 4-5 keV at low F10.7 to about 2-3 keV at high F10.7.
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