Inferred quasi-steady ionospheric neutral winds and electrical currents at 79 deg south latitude in austral summer conditions

Details Inferred quasi-steady ionospheric neutral winds and electrical currents at 79 deg south latitude in austral summer conditions Inferred quasi-steady ionospheric neutral winds and electrical currents at 79 deg south latitude in austral summer conditions

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..217l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 3, p. 217-220

Physics

3

Antarctic Regions, Earth Ionosphere, Geomagnetism, Ionospheric Currents, Magnetic Variations, Summer, Wind (Meteorology), Atmospheric Physics, Ionospheric Conductivity, Magnetometers, Statistical Distributions

Scientific paper

An analysis of the range of geomagnetic variations as measured at Arrival Heights and South Pole stations in the Antarctic over an 8-year interval during the present solar cycle shows that there are quasi-DC level shifts in some of the magnetic components during austral summer conditions when referenced to austral winter. The most dramatic of these level shifts in the signals occurs in the D-component (west-east magnetic component) at Arrival Heights (geomagnetic latitude approximately 79 deg S). The onsets of the D-component shifts occur during a period that lasts one to several days in late austral spring. Such geomagnetic variations would not appear to arise from magnetosphere processes coupling to the ionospheric E-region. The inferred quasi-steady ionospheric current is estimated to be of the order of approximately 10(exp 5) amps above Arrival Heights. It is speculated that neutral wind dynamics with quasi-steady E-region (approximately 110-115 km) neutral wind speeds of approximately 10 m/sec directed east to west above AH are responsible for generating the austral summer electrical currents in the E-region.

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