Upper-atmospheric tidal-interaction effects on geomagnetic and ionospheric variations - A review

Details Upper-atmospheric tidal-interaction effects on geomagnetic and ionospheric variations - A review Upper-atmospheric tidal-interaction effects on geomagnetic and ionospheric variations - A review

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ang....33..115m&link_type=abstract

(International Union of Geodesy and Geophysics, General Assembly, 16th, Grenoble, France, Aug. 25-Sept. 6, 1975.) Annales de Geo

Physics

Geophysics

Atmospheric Tides, Electric Fields, Ionospheric Currents, Lunar Tides, Magnetic Variations, Upper Atmosphere, Bibliographies, E Region, Earth Magnetosphere, F Region, Interplanetary Magnetic Fields, Solar Activity Effects

Scientific paper

Geomagnetic variations on quiet days are primarly caused by electric fields and currents in the ionospheric dynamo region (90 to 150 km altitude), which are produced by the upper atmospheric lunar and solar tidal motions and by the magnetospheric electric field. After a brief introduction to the general morphology and previously suggested explanations of this phenomenon, the present state of investigation into the production mechanism of the electric fields and currents, is outlined. Based on recent observed results of the neutral winds, plasma drifts, and electric fields, which show remarkable differences with respect to height and latitude, and also on recently advanced theories of dynamical interactions between the neutral air and the plasma, it is pointed out that some previous models for the production mechanism of fields and currents are not always satisfactory. A recent model which takes into consideration tidal interactions in the upper-E and lower-F regions is found to be more satisfactory.

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