HR: 09:00h
AN: SM21C-05    [Abstracts]
TI: Investigation of the origin and characteristics of {ULF} waves driven by the solar wind
AU: * Elkington, S R
EM: scot.elkington@lasp.colorado.edu
AF: LASP, University of Colorado, 1234 Innovation Drive, Boulder, CO 80303 United States
AU: Wiltberger, M J
EM: wiltbemj@ucar.edu
AF: HAO/NCAR, 4985 Twin Lakes Rd, Boulder, CO 80301 United States
AU: Chan, A A
EM: aac@rice.edu
AF: Rice University Dept Physics & Astronomy, POB 1892, Houston, TX 77251
AU: Baker, D N
EM: Daniel.Baker@lasp.colorado.edu
AF: LASP, University of Colorado, 1234 Innovation Drive, Boulder, CO 80303 United States
AU: Fei, Y
EM: yfei@rice.edu
AF: Rice University Dept Physics & Astronomy, POB 1892, Houston, TX 77251
AB: ULF waves, with frequencies in the mHz range, are known to efficiently energize and transport relativistic electrons through resonant interactions leading to radial diffusion. However, the global structure, occurrence, and characteristics of the ULF waves are not well known. ULF waves may result from internal geomagnetic processes, such as excitation by ring current ions, or they may result as a consequence of the external interactions between the solar wind and the geomagnetic field. In the latter category, possible sources of ULF wave energy include (i) impulsive variations resulting from changes in the solar wind dynamic pressure; (ii) shear interactions occurring at the magnetopause; and (iii) dynamic variations in the IMF-$B_z$ which lead to changes in the global convection electric field. In this work, we use the Lyon-Fedder-Mobarry MHD code to investigate the nature of magnetospheric ULF waves driven by these three interactions, under controlled, idealized solar wind conditions. In each case, the spatial and temporal characteristics of the waves will be investigated, including the radial penetration, spectral profile, and azimuthal mode structure of the waves.
DE: 2712 Electric fields (2411)
DE: 2720 Energetic particles, trapped
DE: 2730 Magnetosphere--inner
DE: 2740 Magnetospheric configuration and dynamics
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting