Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41c1204w&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM41C-1204
Physics
7833 Mathematical And Numerical Techniques (0500, 3200), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7959 Models
Scientific paper
A nonlinear, two-fluid MHD model in dipole geometry has been used to investigate electromagnetic field fluctuations, both Alfvén wave phenomena as well as quasistatic field structures, on magnetic field lines threading the plasma sheet boundary layer. Results of modeling Cluster satellite observations of electromagnetic field fluctuations occurring at the plasma sheet-polar cap interface will be presented. These results include a minimum variance analysis of the Cluster fields to fit the event to the modeling domain. To drive the simulation, we interpret the Cluster event as the interaction of large-scale downward current channels with the ionosphere. A comparison of simulation results with the Cluster observations suggest that observed small scale structure develops as a consequence of a scale-dependent interaction with the ionosphere and lower magnetosphere.
Karlsson Torgny
Lotko William
Streltsov Alexander
Watts Christopher J.
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