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Detailed Reference Information |
Lanzerotti, L.J., Maclennan, C.G. and Medford, L.V. (1994). Inferred quasi-steady ionospheric neutral winds and electrical currents at 79° south latitude in austral summer conditions. Geophysical Research Letters 21: doi: 10.1029/93GL01352. issn: 0094-8276. |
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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 signal occurs in the D-component (west-east magnetic component) at Arrival Heights (geomagnetic latitude ~79¿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 ~105 amps above Arrival Heights. It is speculated that neutral wind dynamics with quasi-steady E-region (~110--115 km) neutral wind speeds of ~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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Abstract |
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Keywords
Ionosphere, Electric fields, Ionosphere, Polar cap ionosphere, Ionosphere, Auroral ionosphere, Ionosphere, Ionosphere/magnetosphere interactions |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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