Cavity resonance triggered by inward movement of a plasmaspheric plume

Details Cavity resonance triggered by inward movement of a plasmaspheric plume Cavity resonance triggered by inward movement of a plasmaspheric plume

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0307l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0307

Physics

2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer

Scientific paper

We investigate an event in the duskside inner magnetosphere where a sudden inward movement of a pre- existing plasmaspheric plume triggers a cavity resonance between the plume and the plasmapause. The event is recorded by five spacecraft (four Cluster and GOES 8) located in different positions in the cavity: one spacecraft within the plasmapause region and four in the cavity within L =4-6.6. All four spacecraft observe ULF wave mode at ~5 mHz at the same frequency and in the same phase even though the spacecraft are widely separated, indicating that the wave is a fundamental mode cavity resonance. The resonance is first left-hand polarized but changes into the right-hand polarized in the middle of the event at all locations. The event ends on each spacecraft when the spacecraft enters the plume. The plume movement is caused by a sudden change in geomagnetic activity, causing fast convection outside the plume that pushes the plume from L=8-10 to L=6-8.

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