HR: 0800h
AN: SM51B-1289    [Abstracts]
TI: Transpolar Aurorae in Both Hemispheres - Time Evolution, Convection, and Acceleration Potential
AU: * Blomberg, L G
EM: lars.blomberg@alfvenlab.kth.se
AF: Alfvén Laboratory, Royal Institute of Technology, School of Electrical Engineering, Stockholm, SE-10044 Sweden
AU: Cumnock, J A
EM: cumnock@utdallas.edu
AF: Alfvén Laboratory, Royal Institute of Technology, School of Electrical Engineering, Stockholm, SE-10044 Sweden
AU: Cumnock, J A
EM: cumnock@utdallas.edu
AF: University of Texas at Dallas, Center for Space Sciences, PO Box 830688, FO22, Richardson, TX 75083 United States
AU: Alexeev, I I
EM: alexeev@dec1.sinp.msu.ru
AF: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
AU: Belenkaya, E S
EM: elena@dec1.sinp.msu.ru
AF: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
AU: Bobrovnikov, S Y
EM: bobrovnikov@dec1.sinp.msu.ru
AF: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
AU: Kalegaev, V V
EM: kalegaev@dec1.sinp.msu.ru
AF: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
AB: 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.
DE: 2407 Auroral ionosphere (2704)
DE: 2704 Auroral phenomena (2407)
DE: 2712 Electric fields (2411)
DE: 2721 Field-aligned currents and current systems (2409)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005