Initial development of HF radar polar patch caused by azimuthal flow burst in the cusp

Details Initial development of HF radar polar patch caused by azimuthal flow burst in the cusp Initial development of HF radar polar patch caused by azimuthal flow burst in the cusp

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11505305t&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A5, CiteID A05305

Physics

1

Ionosphere: Plasma Convection (2760), Magnetospheric Physics: Cusp, Ionosphere: Plasma Temperature And Density, Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

In this study, we report evidence proving the existence of a close relationship between the initial development of a poleward propagating feature of the HF radar backscatter, that is, HF radar polar patch, and a fast azimuthal flow in the cusp. We focus on two events in which the HF radar polar patch was formed and was identified by the Super Dual Auroral Radar Network radars at Saskatoon, Canada, and Prince George, Canada, on 27 March 2001. We examine their spatial and temporal development. The two events occurred at the interface between the interplanetary magnetic field (IMF) BY-controlled azimuthal flow and the antisunward flow typical of a negative IMF BZ; they developed in a longitudinally asymmetric manner. The increase in ∣BY/BZ∣ when BZ was negative triggered the fast azimuthal flow. We interpret the temporal and spatial development of the HF radar polar patch in terms of the plasma density gradient created by the azimuthal flow and in terms of the subsequent development of the gradient in the direction of both the azimuthal flow and the antisunward flow.

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