HR: 1340h
AN: SA43A-1069    [Abstracts]
TI: Characterization of Intense ULF Wave Power Spectra During the ``Halloween'' 2003 Geomagnetic Storm
AU: * Mann, I R
EM: imann@space.ualberta.ca
AF: Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1 Canada
AU: Loto'aniu, T M
EM: lotoaniu@phys.ualberta.ca
AF: Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1 Canada
AU: Dent, Z C
EM: zdent@phys.ualberta.ca
AF: Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1 Canada
AU: Ozeke, L G
EM: lozeke@phys.ualberta.ca
AF: Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1 Canada
AU: Milling, D K
EM: dmilling@phys.ualberta.ca
AF: Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1 Canada
AU: Rae, I J
EM: jrae@phys.ualberta.ca
AF: Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1 Canada
AU: Waters, C L
EM: colin.waters@newcastle.edu.au
AF: Department of Physics, School of Mathematical and Physical Sciences, The University of Newcastle, University Drive, Callaghan, NSW 2308 Australia
AB: Large amplitude Pc5 ULF waves observed by the CANOPUS, IMAGE and SAMNET magnetometer arrays are characterized during the Halloween 2003 storm. Following storm onset, very large ULF power in discrete frequencies penetrates to very low-$L$ shells spanning in the entire outer radiation belt and into the slot region. This is especially pronounced during 29th October 2003, coincident with the inwards motion of the outer radiation belt into the slot. ULF power is observed with discrete spectral peaks, and using multiple arrays we characterize the global structure of the ULF spectra and examine the excitation of latitudinally localized power enhancements. Comparing the observed waves to the cross-phase derived Alfven continuum, we determine the role of localized discrete field line resonances in the accumulation of this ULF wave power. Further, using the observed Alfven continuum, we examine the Alfven speed profiles on this day and compare the observed wave frequency spectra and power penetration to low-$L$ to that expected theoretically. Finally, comparisons of the ULF power penetration are used to evaluate order of magnitude diffusive transport rates and to investigate the possibility that ULF wave transport can explain the observed radiation belt electron flux transport.
DE: 7871 Waves and instabilities
DE: 2730 Magnetosphere--inner
DE: 2752 MHD waves and instabilities
DE: 2788 Storms and substorms
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting