Transpolar Aurora: Time Evolution, Associated Convection Patterns, and a Possible Cause

Details Transpolar Aurora: Time Evolution, Associated Convection Patterns, and a Possible Cause Transpolar Aurora: Time Evolution, Associated Convection Patterns, and a Possible Cause

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1169b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1169

Physics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2463 Plasma Convection, 2475 Polar Cap Ionosphere, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

We present event studies illustrating the detailed relationships between plasma convection, field-aligned current, polar auroral emissions, and particle precipitation boundaries, as well as illustrating the influence of the Interplanetary Magnetic Field's y-component on theta aurora development. The transpolar arc of the thetas move across the entire polar region and become part of the opposite side of the auroral oval. Electric and magnetic field and precipitating particle data are provided by DMSP, while the Polar UVI instrument provides measurements of auroral emissions. Ionospheric electrostatic potential patterns are calculated at different times during the evolution of the theta aurora using the Royal Institute of Technology model. These model patterns are compared to the convection predicted by mapping the magnetopause electric field to the ionosphere using the Moscow State University's Paraboloid Model of the magnetosphere. A possible cause of the theta aurora in terms of the large-scale convection drivers is discussed.

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