Ion-drag effects in the thermosphere

Details Ion-drag effects in the thermosphere Ion-drag effects in the thermosphere

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..885r&link_type=abstract

(COSPAR, SCOSTEP, IAU, IUGG, URSI, and IUPAP, International Symposium on Solar-Terrestrial Physics, 5th, Innsbruck, Austria, May

Physics

4

Aerodynamic Drag, Geomagnetism, Ionic Collisions, Thermosphere, Wind Velocity, Atmospheric Circulation, F Region, Ionospheric Drift, Statistical Correlation, Temperature Effects

Scientific paper

For thermally driven wind systems, ion drag is the major force that limits the wind velocity whenever (as is frequently the case in the daytime F region) the ion density is large enough for ion drag to exceed the Coriolis force. Ion drag, however, can also play a more active part in that the ions, drifting under the influence of electric fields, can set the neutral air in horizontal motion. Such electrically-driven winds are believed to contribute to the general air circulation in the thermosphere. In the present paper, the role of electrodynamic drifts in the thermosphere is described, and some specific situations in which ion drag is an important factor are discussed. Particular attention is given to the geomagnetic control of thermospheric structure at low latitudes; the net eastward rotation of the thermosphere; and the correlation between the plasma velocity components in the F region.

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