Seasonal variations of L equivalent current systems

Details Seasonal variations of L equivalent current systems Seasonal variations of L equivalent current systems

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..285m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 285-294.

Physics

6

Geomagnetism, Ionospheric Currents, Annual Variations, E Region, Spherical Harmonics

Scientific paper

Equivalent ionospheric current systems of the lunar daily geomagnetic variations during a solar active period are estimated from geomagnetic data for the three seasons and the yearly average. The external current intensity ratio in summer over winter is 1.4-6.0 for the diurnal current, 1.3-3.7 for the semi-diurnal current, and 1.3-4.1 for the combined current of the first four harmonics. Also, the phase of the current in local winter frequently shifts, to a large extent, relative to the yearly average current system. This anomalous behavior during solstitial months, particularly in winter, is caused by lunar tidal wind variations. It is emphasized that the L current flows mainly at the ionospheric E region which is same as for the Sq current.

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