HR: 0800h
AN: SM41C-1204    [Abstracts]
TI: Numerical Modeling of Alfven Waves and Quasistatic Field Structures in the Plasma Sheet Boundary Layer
AU: * Watts, J C
EM: Jonathan.C.Watts@Dartmouth.edu
AF: Thayer School of Engineering, Dartmouth College 8000 Cummings Hall, Hanover, NH 03755-8000 United States
AU: Lotko, W
EM: William.Lotko@Dartmouth.edu
AF: Thayer School of Engineering, Dartmouth College 8000 Cummings Hall, Hanover, NH 03755-8000 United States
AU: Streltsov, A
EM: Anatoly.Streltsov@Dartmouth.edu
AF: Thayer School of Engineering, Dartmouth College 8000 Cummings Hall, Hanover, NH 03755-8000 United States
AU: Karlsson, T
EM: tomas.karlsson@alfvenlab.kth.se
AF: Alfvén Laboratory, Royal Institute of Technology, Stockholm, SE-100 44 Sweden
AB: 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.
DE: 7833 Mathematical and numerical techniques (0500, 3200)
DE: 7836 MHD waves and instabilities (2149, 2752, 6050)
DE: 7959 Models
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005