Polar cap convection for B(z) northward

Details Polar cap convection for B(z) northward Polar cap convection for B(z) northward

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..657c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, April 3, 1992, p. 657-660.

Physics

17

Convection, Diurnal Variations, Flow Velocity, Interplanetary Magnetic Fields, Polar Caps, Convective Flow, Ionospheric Drift

Scientific paper

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.

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