HR: 1340h
AN: SM43C-1241    [Abstracts]
TI: Ground-based Observations of ULF Waves in the Cusp Region and at Substorm Onset as Possible Evidence for Reconnection
AU: * Lessard, M R
EM: marc.lessard@unh.edu
AF: University of New Hampshire, Space Science Center Morse Hall, Durham, NH 03824 United States
AU: Rogers, B
EM: barrett.rogers@dartmouth.edu
AF: Dartmouth College, Dept of Physics HB 6127, Hanover, NH 03755 United States
AU: Engebretson, M
EM: engebret@augsburg.edu
AF: Augsburg College, Dept of Physics 2211 Riverside Avenue, Minneapolis, MN 55454 United States
AB: Various studies have shown increasingly that Pi1B pulsations are associated with substorm onset. While these pulsations have been observed on the ground for decades, recent results show that they are also observed at geosynchronous orbit at substorm onset, where they are compressional in nature. Signatures of pulsations with quite similar characteristics have also been observed on the ground in the cusp region. The similar characteristics of these pulsations, observed at times and locations where reconnection is often thought to occur, raises the question whether these pulsations may, in fact, be artifacts of the reconnection process. In this study, spectral properties associated with reconnection are investigated using results of two fluid numerical simulations of reconnection in simple geometries. The spectral analysis considers the variability in various quantities during the reconnection process, with the implicit assumption that the variability is emitted in the form of wave power that eventually is observed in space and on the ground.
DE: 2487 Wave propagation (0689, 3285, 4275, 4455, 6934)
DE: 2706 Cusp
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 2772 Plasma waves and instabilities (2471)
DE: 2790 Substorms
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005