Physics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1559g&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 39, Nov. 1991, p. 1559-1567, 1569-1571. Research supported by University of A
Physics
4
Doppler Effect, Magnetohydrodynamic Flow, Magnetospheric Ion Density, Particle Emission, Plasma Drift, Plasma Temperature, Extreme Ultraviolet Radiation, Oxygen Ions, Radiation Belts, Solar Flux
Scientific paper
The effects of Doppler shifting on the line centers of the magnetospheric O(+) cross section are investigated, and the resulting structure of the scattering rate as a function of bulk density is explained. Whereas the Doppler shifting frequently results in a decrease of the scattering rate, it is demonstrated that for certain drift speeds the overlap of the cross section and the solar intensity profile can lead to an increased rate, thus enhancing the relative brightness of the image above that obtained when v(p) is zero. Simulated images of the magnetosphere are obtained which are used to show quantitively how the magnetospheric image responds to variations in plasma drift speed and temperature. Changes in the brightness of the magnetospheric images also depend on the variability of the solar flux at 83.4 nm. In regions where there are plasma drifts, the brightness in the image is governed by the structure of the scattering rate, assuming a fixed temperature.
Akasofu Syuh-Ichi
Garrido Dante E.
Smith Reginald W.
Swift D. S.
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