Polar's Observations of Pc Pulsations in Near-Earth Tail

Details Polar's Observations of Pc Pulsations in Near-Earth Tail Polar's Observations of Pc Pulsations in Near-Earth Tail

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm44a..05g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM44A-05

Physics

2744 Magnetotail, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2764 Plasma Sheet

Scientific paper

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.

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