Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1650s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1650
Physics
2704 Auroral Phenomena (2407), 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
We present results from a numerical study of ultra-low-frequency electromagnetic waves and magnetic field- aligned currents observed by Cluster satellites in the high-latitude magnetosphere. Usually, these waves are registered on the boundaries between downward and upward large-scale magnetic field-aligned current channels or inside the downward current channel. The goal of this study is to explain spatial structure (in particular, perpendicular wavelength of the order of 12-14 km at 100 km altitude) and frequency (10-20 mHz) of small-scale electromagnetic waves observed by Cluster satellites inside two neighboring downward current channels in the auroral magnetosphere at the radial distance of 5 RE. The main hypothesis investigated in this study is that these waves are generated by the interaction between large-scale magnetic field-aligned currents and the ionosphere. The numerical model used to investigate these interactions is based on a nonlinear system of partial differential equations representing reduced, two-fluid MHD. This model includes effect of the active ionospheric feedback on structure and amplitude of magnetic field-aligned currents interacting with the ionosphere and it is implemented numerically in the realistic dipole magnetic field geometry. Simulations confirm that localized electromagnetic waves with parameters close to ones observed by Cluster indeed can be generated by a large-scale, slowly evolving current system interacting with the ionosphere when certain geophysical conditions are satisfied.
Karlsson Torgny
Streltsov Anatoly V.
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