Simultaneous Polar Aurorae and Convection Patterns in Both Hemispheres

Details Simultaneous Polar Aurorae and Convection Patterns in Both Hemispheres Simultaneous Polar Aurorae and Convection Patterns in Both Hemispheres

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1170c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1170

Physics

2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2463 Plasma Convection, 2475 Polar Cap Ionosphere, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

Transpolar arcs are often observed during northward IMF with dawnside (duskside) formation of the TPA and duskward (dawnward) motion occurring when By changes from negative to positive (positive to negative). Whereas simultaneous theta aurorae have been observed in both hemispheres utilizing satellite UV imagers, it is unknown how often theta aurorae occur in both hemispheres and the influence of the IMF. We investigate occurrence of TPAs in both hemispheres. Polar UVI provides images in the northern hemisphere while DMSP provides ionospheric plasma flow and precipitating particle data in both hemispheres. Concurrent solar wind plasma and interplanetary magnetic field measurements are provided by the ACE satellite. Observations indicate that TPAs and theta aurorae depend not only on the orientation of IMF Bz, but on the direction of IMF Bx and By as well. Utilizing the satellite data as inputs, the Royal Institute of Technology model provides the high-latitude ionospheric electrostatic potential patterns in both hemispheres calculated at different times during the evolution of the theta aurora resulting from a variety of field-aligned current configurations associated with the changing global aurora.

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