Time variation of instantaneous equivalent Sq current system

Details Time variation of instantaneous equivalent Sq current system Time variation of instantaneous equivalent Sq current system

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..911t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Oct. 1984, p. 911-915.

Physics

11

Diurnal Variations, Geomagnetism, Ionospheric Currents, Magnetic Variations, Atmospheric Tides, Harmonic Analysis, Interplanetary Magnetic Fields, Magnetic Disturbances, Spherical Harmonics

Scientific paper

The time variation of the instantaneous equivalent Sq current system during March 1-18, 1980 has been examined by removing the averaged UT variation caused by the difference between geographic and geomagnetic coordinate systems. The additional current system thus obtained shows several typical patterns which explain the variation field. Some of them may be explained by the IMF polarity effect or by the geomagnetic disturbance field of polar origin, but others appear to be caused by the variation of the ionospheric dynamo. The latter lasts for several hours or sometimes for over ten hours and may be explained by the variation of diurnal or semidiurnal tidal winds.

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