HR: 09:15h
AN: SM41D-05    [Abstracts]
TI: Energetic Particle Modulation by ULF waves in the inner magnetosphere
AU: * Zong, Q
EM: zong@bu.edu
AF: Center For Space Physics, Boston University, 725 Commonwealth Ave., Boston, MA 02215 United States
AU: Fritz, T
SM41D-05 AF: Center For Space Physics, Boston University, 725 Commonwealth Ave., Boston, MA 02215 United States
AU: Baker, D
SM41D-05 AF: Lab. for Atmos. and Space Physics, University of Colorado, University of Colorado, Boulder, 80303 United States
AU: Fu, S
SM41D-05 AF: ISPAT, Peking University, Beijing, China, Beijing, 100871 China
AU: Xie, L
SM41D-05 AF: Center For Space Physics, Boston University, 725 Commonwealth Ave., Boston, MA 02215 United States
AU: Daly, P
SM41D-05 AF: Max-Planck-Institut fuer Sonnersystemfunsong, Germany., Katlenburg-Lindau, D-37191 Germany
AU: Balogh, A
SM41D-05 AF: Centre d'Etude Spatiale des Rayonnements, 9, avenue du Colonel Roche, Toulouse, Cedex 4 France
AU: Reme, H
SM41D-05 AF: Space and Atmospheric Physics Group, Imperial College, London, UK, London, SW7 2BW United Kingdom
AB: One of most important questions in the Earth's radiation belt is to determine the dominant processes which accelerate magnetospheric several keV electrons to MeV energies. In particular recent studies have emphasized the question of the relative dominance of ULF and VLF wave acceleration processes across the outer belt. Energetic electron and ion flux and spectra variations associated with ULF waves in the inner magnetosphere have been examined by using Cluster spacecraft data. The quasi-periodic particle flux (electron 30 keV to 500 keV, proton 30 keV to 1.5 MeV) modulations are observed in the the region of L=5.3 to 11.7 at MLT=8. The relative phase of energetic electron and ion are different in the different location, also, depend on the energy of the particles. The particle fluxes were found to be either 90 or 270 out of phase with the magnetic variations. For the phase difference between the ion density and the magnetic variation, this argues that the time-average Poynting flux of the Pc5 wave along the ambient magnetic field is approximately zero, this indicates that Pc5 waves are standing waves along the field line. In-situ ULF measurements from inside geosynchros orbit are not commonly available. Multi-point measurements of the ULF wave electric and magnetic field morphology, as well as radiation belt particle flux, are made in this paper to examine the efficiency of the ULF process in the outer belt. Cluster constellation allow to determine wave coherence length and mode structure, which are critical parameters for determining the efficiency of the ULF wave drift-resonance interaction.
DE: 2720 Energetic particles: trapped
DE: 2730 Magnetosphere: inner
DE: 2731 Magnetosphere: outer
DE: 2752 MHD waves and instabilities (2149, 6050, 7836)
DE: 7852 Solitons and solitary waves (4455)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005