Physics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6475c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6475-6486. Navy-supported research.
Physics
25
Geomagnetism, Ionospheric Currents, Magnetic Poles, Northern Hemisphere, Annual Variations, Asia, Diurnal Variations, Europe, Geomagnetic Latitude, Harmonic Analysis, North America, Spatial Distribution
Scientific paper
A special selection of extremely quiet 1965 geomagnetic daily variation records from North America, Europe, central Asia, and east Asia was used to determine monthly spherical harmonic analysis coefficients representing the Sq fields from these regions. The coefficients permitted a separation of the external and internal contributions to the daily variations. Month-by-month behavior of the equivalent external current system and contours of the daily range of this current showed regional differences in amplitude and location of the equivalent ionospheric currents with seasonal change. Current foci locations reached 35 deg to 42 deg geomagnetic latitude in summer and 18 deg to 35 deg in winter with a regional dependence. The largest daily range of external current was 146,000 A in North America, 153,000 A in Europe, 137,000 A in central Asia, and 123,000 A in east Asia. Continental differences in the behavior of the current seemed to be explained by the relative position of the geographic and geomagnetic poles with respect to these regions.
Campbell Wallace H.
Schiffmacher Edward R.
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