Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm51a1272l&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM51A-1272
Physics
2716 Energetic Particles: Precipitating, 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling
Scientific paper
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.
Lu Jianhua
Marchand Régine
Rankin Robert
Tikhonchuk Vladimir T.
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