Departures from diffusive equilibrium in the topside F-layer from satellite soundings

Details Departures from diffusive equilibrium in the topside F-layer from satellite soundings Departures from diffusive equilibrium in the topside F-layer from satellite soundings

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..425l&link_type=abstract

Journal of Atmopsheric and Terrestrial Physics, vol. 44, May 1982, p. 425-440.

Computer Science

Sound

14

F Region, Ionospheric Sounding, Oxygen Ions, Plasma Diffusion, Satellite Sounding, Upper Ionosphere, Friction Drag, Ion Motion, Plasma Temperature, Positive Ions, Scale Height

Scientific paper

A method for the detection of O(+) ion fluxes from topside soundings is described. The shape of the plasma scale-height profile is altered by such flows only at heights near the F2-peak, where ion-neutral drag is large. Model profiles are used to relate changes in scale height to the ratio (phi/phi sub L) where phi is the field-aligned O(+) flux (relative to the neutral air) and phi sub L is the limiting value set by frictional drag. Values of (phi/phi sub L) can then be determined to within a few per cent from experimental soundings, using the plasma temperature and its gradient (as deduced from the observed profile) and the MSIS model neutral temperature. It was found that 3700 topside profiles show departures from diffusive equilibrium, out of 10,000 used to obtain the global morphology of (phi/phi sub L) near the sunspot minimum. Results reveal dynamic ion-flow effects such as the transequatorial breeze and the effects of the polar wind and protonospheric replenishment light-ion flows can be inferred.

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