Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm42a..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM42A-08
Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2776] Magnetospheric Physics / Polar Cap Phenomena
Scientific paper
High Latitude Dayside Aurora (HiLDA) is a localized aurora well separated from the auroral oval. It occurs in the 10-17 MLT regions above 75 degrees magnetic latitude. Northern hemisphere observations established it as a summer phenomenon occurring during northward IMF with a strong positive By (clock angle 60-90 degrees). It was speculated that HiLDA is only indirectly related to magnetopause reconnection and rather the result of magnetospheric driving and electrostatic acceleration in a current circuit between the inner magnetosphere and the ionosphere. We analyzed data from the IMAGE/FUV instrument during the southern summer month of December 2004 in order to test the prediction of occurrence during complementary conditions to the northern hemisphere, namely strong negative By (clock angles 270-300 degrees). We found several cases together with fortunate spacecraft crossings by FAST and DMSP that allow us to confirm at least a few of the expectations. This aurora is caused by the asymmetry of field-aligned currents in different seasons and the variation of MI coupling with solar illumination.
Chaston Christopher. C.
Frey Harald U.
Mende Stephen B.
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