HR: 1340h
AN: SM43A-1066    [Abstracts]
TI: Anti-phase oscillation of energetic electron and proton fluxes: Cluster observations
AU: * Zhou, X
EM: zhouxz@pku.edu.cn
AF: Peking University, 5 Yiheyuan Road, Beijing, 100871, China
AU: * Zhou, X
EM: zhouxz@pku.edu.cn
AF: University of Massachusetts Lowell, 600 Suffolk Street, Lowell, MA 01854, United States
AU: Zong, Q
EM: qiugang_zong@uml.edu
AF: Peking University, 5 Yiheyuan Road, Beijing, 100871, China
AU: Zong, Q
EM: qiugang_zong@uml.edu
AF: University of Massachusetts Lowell, 600 Suffolk Street, Lowell, MA 01854, United States
AU: Song, P
EM: paul_song@uml.edu
AF: University of Massachusetts Lowell, 600 Suffolk Street, Lowell, MA 01854, United States
AU: Pu, Z
EM: zypu@pku.edu.cn
AF: Peking University, 5 Yiheyuan Road, Beijing, 100871, China
AU: Li, X
EM: lix@lasp.colorado.edu
AF: University of Colorado Boulder, 1234 Innovation Drive, Boulder, CO 80303, United States
AU: Fu, S
EM: suiyanfu@pku.edu.cn
AF: Peking University, 5 Yiheyuan Road, Beijing, 100871, China
AU: Wang, Y
AF: Peking University, 5 Yiheyuan Road, Beijing, 100871, China
AB: Simultaneous modulation of energetic electron and proton fluxes in the outer radiation belt with the phase difference between them of 180 degrees were observed by the Cluster satellites during a magnetic storm period on Oct. 31, 2003. The "out-of-phase" event, surprisingly, was observed associated with the toroidal ultra-low frequency (ULF) waves instead of the compressional ones, and therefore could not be caused by the mirror effect (Kivelson and Southwood, 1985). To explain the unexpected 180 degree phase difference, we analyze the behaviors of both the electrons and the protons in the toroidal waves, and highlight the role of the background convection. With the effect of the strong convectional electric field, the anti-phase modulation between the electron and the proton fluxes can be understood and predicted. The convection may also affect the modulation amplitude of the ULF waves, and further accelerate particles with a broader energy range by changing the wave-particle resonance conditions.
DE: 2720 Energetic particles: trapped
DE: 2752 MHD waves and instabilities (2149, 6050, 7836)
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting