HR: 0800h
AN: SM51A-1272    [Abstracts]
TI: Electrodynamics of the Magnetosphere-Ionosphere Coupling: Non-Perturbative Results of ULF pulsations
AU: * Lu, J
EM: jlu@space.ualberta.ca
AF: University of Alberta, Department of Physics, Edmonton, AB T6G2J1 Canada
AU: Rankin, R
EM: rankin@space.ualberta.ca
AF: University of Alberta, Department of Physics, Edmonton, AB T6G2J1 Canada
AU: Marchand, R
EM: richard.marchand@ualberta.ca
AF: University of Alberta, Department of Physics, Edmonton, AB T6G2J1 Canada
AU: Tikhonchuk, V T
EM: tikhon@celia.u-bordeaux1.fr
AF: Universite Bordeaux, Centre Laser Intenses et Applications, Talence, 33405 France
AB: Using a two-dimensional nonlinear finite element model, we investigate the electromagnetic oscillations generated by the ionospheric feedback instability. The coupling of dispersive Alfven waves and compressional waves is described by full set of MHD equations and the nonlinear evolution of Alfven waves and their coupling with full compressional waves are considered. The ionospheric feedback instability can develop inside the global magnetospheric resonator when there exists a perpendicular electric field and the ionospheric conductivity is low. It is shown that the small-scale ULF geomagnetic pulsations and corresponding density perturbation can be explained in terms of Alfven waves and compressional waves generated by the ionospheric feedback instability.
DE: 2716 Energetic particles: precipitating
DE: 2721 Field-aligned currents and current systems (2409)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
DE: 2752 MHD waves and instabilities (2149, 6050, 7836)
DE: 2753 Numerical modeling
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005