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Ann. Geophys., 18, 782-788, 2000
www.ann-geophys.net/18/782/2000/
© European Geosciences Union 2000
Dayside ionospheric response to changes in IMF polarity: optical and plasma-flow observations
S. E. Pryse, A. M. Smith, and L. Kersley
Department of Physics, University of Wales, Aberystwyth, SY23 3BZ, UK
e-mail: lek@aber.ac.uk
Correspondence to: L. Kersley
Abstract. The response of the dayside ionosphere to
changes in polarity of the interplanetary magnetic field was observed by two
independent techniques. The signatures were seen in the 630.0 nm red-line
emission, measured by a meridian scanning photometer at Ny-Ålesund on Svalbard,
and also in the line-of-sight plasma velocities monitored by the Finland CUTLASS
SuperDARN radar. A time difference of some 6 to 8 min occurred between the
responses of the two techniques, with the flows being first to respond. In the
present case study, the longer delay in the optics suggests that ion
precipitation controls the auroral emission.
Key words: Ionosphere (ionosphere-magnetosphere
interactions) · Magnetospheric physics (magnetosphere-ionosphere interactions;
polar cap phenomena)
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