Afternoon radar aurora and polar cap convection pattern

Details Afternoon radar aurora and polar cap convection pattern Afternoon radar aurora and polar cap convection pattern

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..329o&link_type=abstract

In its Achievements of the Intern. Magnetospheric Study (IMS) p 329-330 (SEE N85-24544 14-46)

Computer Science

Auroral Ionization, Backscattering, Convection Currents, Diurnal Variations, Polar Caps, Auroral Electrojets, E Region, Electric Fields

Scientific paper

The location of the afternoon radar aurora determined from STARE measurements was compared with the location of visual aurora and of the ionization trough in the auroral ionosphere. It is found that the radar aurora is, in the afternoon, located considerably equatorwards of the visual aurora and the trough minimum. It is suggested that in this local time sector the convection electric field causes instability waves in the existing normal E region ionization, so that the equatorward boundary of the afternoon radar aurora is observed at the latitude where the convection electric field, which decreases with decreasing latitude, drops below the instability threshold. Consequently, an auroral radar such as STARE could be used to monitor the equatorward boundary of the clockwise cell of the polar cap convection pattern in this time sector.

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