HR: 11:50h
AN: SM22B-07    [Abstracts]
TI: Ground-Based and FAST Observations of Pc 1-2 Type ULF Waves in the Dayside Cusp Region
AU: * Kim, H
EM: hyomin.kim@unh.edu
AF: Space Science Center, University of New Hampshire, 39 College Road, Durham, NH 03824, United States
AU: Lessard, M
EM: marc.lessard@unh.edu
AF: Space Science Center, University of New Hampshire, 39 College Road, Durham, NH 03824, United States
AU: Engebretson, M
EM: engebret@augsburg.edu
AF: Physics Department, Augsburg College, 2211 Riverside Ave, Minneapolis, MN 55454, United States
AU: Lund, E
EM: eric.lund@unh.edu
AF: Space Science Center, University of New Hampshire, 39 College Road, Durham, NH 03824, United States
AU: Yahnin, A
EM: yahnin@pgi.kolasc.net.ru
AF: Polar Geophysical Institute, Apatity, Murmansk region, 184209, Russian Federation
AB: A closely-spaced search-coil ultra low frequency (ULF) magnetometer array installed in the northern hemisphere (Svalbard) observes Pc 1-2 type wave activity in the dayside cusp region. Perhaps the most commonly observed type of events is band-limited pulsations which typically occur from approximately 9 to 17 MLT over frequencies ranging from 0.2 to 0.4 Hz. Besides the band-limited features, some of the events display a variety of spectral structures such as increasing (or decreasing) tones, broad-band bursts, harmonic structures, etc. This study focuses on FAST observations of the events in conjunction with the ground-based magnetometer data. The FAST satellite, which overflew the regions where the magnetic footprints map down to the locations of the magnetometers, shows that the ion/electron energies and pitch angle distributions observed by the satellite during the wave events are consistent with Alfven wave produced aurora - Alfvenic aurora. This implies that the ULF wave events provide the energy to generate the Alfvenic aurora. We discuss the effects of the wave activity in the magnetospheric/ionospheric processes using the simultaneous observations of the ground-based magnetometer and FAST satellite along with the ground-based all-sky auroral imagers.
DE: 2407 Auroral ionosphere (2704)
DE: 2706 Cusp
DE: 2736 Magnetosphere/ionosphere interactions (2431)
DE: 6984 Waves in plasma (7867)
DE: 7836 MHD waves and instabilities (2149, 2752, 6050)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting