Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..933c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Feb. 1, 1988, p. 933-944. Navy-supported research.
Physics
14
Geomagnetism, Ionospheric Currents, Southern Hemisphere, Annual Variations, Diurnal Variations, Spherical Harmonics, Summer, Tropical Regions, Winter
Scientific paper
This work discribes the month-by-month behavior of the equivalent ionospheric current systems derived from spherical harmonic analyses of the quiet time geomagnetic field daily variations in 1965 at selected observatories representing the three southern global half-sector regions separately encompassing South America, Africa, and Australia. These external Sq current patterns were vortices having midlatitude foci with midday summertime amplitudes reaching 162,000 A above the midnight level. The wintertime amplitudes were about 100,000 A smaller. At low latitudes there was a large intrusion of the opposite-hemisphere external Sq current system into the wintertime hemisphere at prenoon hours, displacing the primary current vortex to later postnoon hours. The behavior of the Southern Hemisphere external currents were found to be seasonally similar to those of the Northern Hemisphere for the same year. The quiet year behavior was compared to the results for the 1958 active year determined earlier by Matsushita (1967).
Campbell Wallace H.
Schiffmacher Edward R.
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