Localized Dayside Proton-induced Auroral Emissions in the Cusp and Polar Cap

Details Localized Dayside Proton-induced Auroral Emissions in the Cusp and Polar Cap Localized Dayside Proton-induced Auroral Emissions in the Cusp and Polar Cap

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11a1681b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11A-1681

Physics

[2475] Ionosphere / Polar Cap Ionosphere, [2704] Magnetospheric Physics / Auroral Phenomena, [2706] Magnetospheric Physics / Cusp

Scientific paper

Localized dayside proton-induced emissions were identified using the FUV SI-12 imager aboard the IMAGE satellite. The SI-12 instrument detects emissions induced by protons with energies greater than 1 keV. Two types of localized emissions were identified on the dayside in the polar cap region. There are localized emissions significantly poleward of the auroral oval in the polar cap and there are cusp-like emissions along the open-closed field boundary. These two localized emissions have distinctive properties that often differ. Previously it has been shown that the IMF controls both the location and the intensity of cusp aurora. It has also been shown that the cusp aurora intensity is controlled by both solar wind dynamic pressure and the values of Bz. Cusp aurora exists in both southward and northward IMF conditions however, the polar cap spots exist only in northward IMF conditions. In this case, Bx appears to play a role in the location of the polar cap spots. The location and intensity of the polar cap spots will be described in relation to upstream IMF conditions. A comparison of the locations of both the polar cap and cusp-like spots with SuperDARN convection patterns will be examined. Possible reconnection scenarios are presented in relation to occurrence rates, locations, and intensities of the localized polar cap spots.

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