Post-Midnight ULF waves observed by Cluster

Details Post-Midnight ULF waves observed by Cluster Post-Midnight ULF waves observed by Cluster

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43d..08e&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43D-08

Other

7836 Mhd Waves And Instabilities (2149, 2752, 6050)

Scientific paper

The four Cluster spacecraft have proven to be an excellent platform for studying ultra low frequency waves in the magnetosphere. Determining the azimuthal wave number previously required a serendipitous alignment of several single satellites. This can now be done more or less routinely with Cluster. Here we present a ULF wave observed in the post-midnight/morning sector of the magnetosphere at L=16 RE. The wave has a toroidal mode polarization. We estimate the azimuthal wave number to m=3, consistent with a toroidal mode type pulsation. The frequency of the wave is not constant with time but changes from 2.5 mHz to 1.0 mHz. This change coincides with a drop in the total magnetic field strength and we speculate if this is related to an observed reversal of the sign of the interplanetary magnetic field (IMF) By component. This event occurs at relatively quiet magnetospheric conditions with a solar wind speed of approximately 400 km/s, thus the Kelvin-Helmholtz instability is unlikely to cause the pulsations. We look at other possible driving mechanisms.

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