Transpolar Aurorae in Both Hemispheres - Time Evolution, Convection, and Acceleration Potential

Details Transpolar Aurorae in Both Hemispheres - Time Evolution, Convection, and Acceleration Potential Transpolar Aurorae in Both Hemispheres - Time Evolution, Convection, and Acceleration Potential

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm51b1289b&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM51B-1289

Physics

2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

We present event studies illustrating the detailed relationships in both hemispheres between plasma convection, field-aligned currents, and polar auroral emissions, as well as illustrating the influence of the Interplanetary Magnetic Field's y-component on theta aurora development. The transpolar arc of the theta aurorae moves across the entire polar region and becomes 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 KTH model. These model patterns are compared to the convection predicted by mapping the magnetopause electric field to the ionosphere using the Paraboloid Model of the magnetosphere. The model predicts that parallel electric fields are set up along the magnetic field lines projecting to the transpolar aurora. Their possible role in the acceleration of the auroral electrons is discussed.

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