F-region seasonal behavior as measured by the MU radar

Details F-region seasonal behavior as measured by the MU radar F-region seasonal behavior as measured by the MU radar

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..599f&link_type=abstract

(Thermospheric and ionospheric dynamics; Symposium, Exeter, England, July 1989, Selected Papers. A92-10626 01-46) Journal of Atm

Physics

18

Annual Variations, F Region, Geomagnetism, Incoherent Scatter Radar, Ion Temperature, Plasma Temperature, Diurnal Variations, Ionospheric Composition, Ionospheric Electron Density, Ionospheric Temperature, Photoionization, Plasma Drift

Scientific paper

A model of the ion-vector velocity is extended to one-year by using a larger base of MU radar incoherent-scatter (IS) data which permits analysis of the seasonal variations in ionospheric drifts, density, and temperatures. Patterns of electron-density and plasma-temperature behavior are also analyzed for relationships with the solstices and equinoxes. The timing of the diurnal change of direction of the neutral wind with respect to the time of sunset is found to determine the seasonal behavior of electron density which is also related to the neutral composition behavior. A high-altitude O(+) layer and a low-altitude molecular-ion layer vie for greatest density, and during the summer and/or times of strong magnetic disturbance the molecular-ion layer is stronger. Other effects are described including the dominance of electron density over mean equinox daytime F-region electron and ion temperatures.

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