Sq and L currents in the ionosphere

Details Sq and L currents in the ionosphere Sq and L currents in the ionosphere

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38..295m&link_type=abstract

Annales de Geophysique, vol. 38, July-Sept. 1982, p. 295-305.

Physics

Atmospheric Tides, Geomagnetism, Ionospheric Currents, Lunar Tides, Magnetic Variations, Solar Terrestrial Interactions, Annual Variations, Anomalies, Current Density, E Region, Earth-Moon System, External Surface Currents, Field Aligned Currents, Harmonic Analysis, Ionospheric Electron Density, Polar Regions, Ring Currents, Solar Cycles, Spherical Harmonics

Scientific paper

The existence of an anomaly and currents in the polar region were discovered in a study of geophysical data obtained at 100 earth stations. A spherical harmonic analysis was employed to estimate the equivalent ionospheric L (lunar) current systems, which display weak current intensities with phase shifts during the winter, indicating a winter anomaly in the ionospheric winds. Lunar currents in the polar region were found to be four oppositely convecting circular currents with 3-4 kA in total current intensity in the semidiurnal component. Two circular currents were identified in the diurnal component, and were treated as a product of field-aligned currents and high-latitude ionospheric dynamo. The Sq variations were determined to have a higher dependence on the solar cycle than do the L variations; however, the L variations display a greater seasonal effect than Sq. The causes for the difference in effects were concluded to be ionospheric winds and Sq and L currents in the daytime flowing in the same ionospheric E region.

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