Polar cap convection for B(z) northward

Polar cap convection for B(z) northward

The Digisonde at Qanaq, Greenland measures the ionospheric convection velocity in the central polar cap. The average local time variation of the velocity for B(z) northward under various B(y) conditions is presented. The nightside drifts for B(z) northward tend to be antisunward, and resemble those...

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Veröffentlicht in:Geophysical research letters 1992-04, Vol.19, p.657-660
Hauptverfasser: Crowley, G, Cannon, P S, Dozois, C G, Reinisch, B W, Buchau, J
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container_title Geophysical research letters
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creator Crowley, G
Cannon, P S
Dozois, C G
Reinisch, B W
Buchau, J
description The Digisonde at Qanaq, Greenland measures the ionospheric convection velocity in the central polar cap. The average local time variation of the velocity for B(z) northward under various B(y) conditions is presented. The nightside drifts for B(z) northward tend to be antisunward, and resemble those which occur for southward IMF, as pointed out by Heppner and Maynard (1987). However, it is difficult to reconcile the observed diurnal drift variation with the Heppner-Maynard distorted two-cell model. Modified forms of the Potemra et al., (1984) four cell model offer a more plausible framework in which to understand the Qanaq data. The polar cap cells are relatively small and are displaced towards the dayside. (Author)
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title Polar cap convection for B(z) northward
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