HR: 17:00h
AN: SM44A-05    [Abstracts]
TI: Polar's Observations of Pc Pulsations in Near-Earth Tail
AU: * Ge, Y S
EM: yasong@igpp.ucla.edu
AF: University of California Los Angeles, Institute of Geophysics and Planetary Physics, 405 Hilgard Ave., Los Angeles, CA 90095-1567 United States
AU: Russell, C T
EM: ctrussell@igpp.ucla.edu
AF: University of California Los Angeles, Institute of Geophysics and Planetary Physics, 405 Hilgard Ave., Los Angeles, CA 90095-1567 United States
AB: When the Polar spacecraft passes the magnetospheric equator at 9 RE in the tail, very monochromatic continuous pulsations (Pc pulsations) are seen. The frequencies of the pulsations observed varies from 4 to 17 mHz which are within Pc 4 and Pc 5 pulsation frequency band. While most events are Pc 4 pulsations and waves are transverse, one event of frequency 4 mHz has a larger compressional component than transverse. The IMF during these waves is mostly radial and northward. The pulsations appear to occur during the quiet times of tail following disturbed times. Cold plasma data from TIDE on Polar has been also examined. Clear correlation between cold plasma pressure and magnetic pressure is seen in all events within the central plasma sheet, while the plasma pressure is anti-correlated with magnetic pressure when the wave is close to the boundary of the plasma sheet.
DE: 2744 Magnetotail
DE: 2752 MHD waves and instabilities (2149, 6050, 7836)
DE: 2764 Plasma sheet
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005