Characterization of Intense ULF Wave Power Spectra During the ``Halloween'' 2003 Geomagnetic Storm

Details Characterization of Intense ULF Wave Power Spectra During the ``Halloween'' 2003 Geomagnetic Storm Characterization of Intense ULF Wave Power Spectra During the ``Halloween'' 2003 Geomagnetic Storm

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa43a1069m&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA43A-1069

Physics

7871 Waves And Instabilities, 2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

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.

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