Computer Science – Numerical Analysis
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..773w&link_type=abstract
Planetary and Space Science, vol. 25, Aug. 1977, p. 773-786.
Computer Science
Numerical Analysis
12
Electron Precipitation, F Region, Ionospheric Ion Density, Oxygen Ions, Transient Response, Upper Ionosphere, Earth Magnetosphere, Gas Heating, Numerical Analysis, Polar Regions, Time Dependence
Scientific paper
A numerical time-dependent model of the topside and F-layer ionosphere is used to describe how the density of O(+) ions and the plasma temperatures change as a result of transient electron precipitation with a soft energy spectrum. The response time for electron gas heating is about 2 min; for changes in topside scale height it is from 5 to 15 min, depending on altitude; and for changes in F-layer peak density, it is more than an hour. The low-density topside ion gas is thermally isolated on a short time scale; consequently, the ion temperature responds almost adiabatically to volume changes. A transient precipitation event initiates a disturbance that propagates upward at approximately the sonic speed in the plasma, growing in amplitude with height. Such an event has little effect on the density at the peak of the F layer. An element of ionosphere that drifts horizontally in an antisunward direction through the magnetospheric cleft and into the polar cap receives some ionization from the cleft, but not enough to be decisive in its survival. The collapse of the topside when heating is removed increases temporarily the density of the F layer.
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