Observations of a cavity mode outside the plasmasphere by THEMIS

Details Observations of a cavity mode outside the plasmasphere by THEMIS Observations of a cavity mode outside the plasmasphere by THEMIS

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2069h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2069

Physics

Plasma Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7868] Space Plasma Physics / Wave/Wave Interactions

Scientific paper

Standing fast mode waves known as cavity modes have been extensively studied as a potential driver of monochromatic shear Alfvén waves in Earth's magnetosphere via the field line resonance (FLR) mechanism, but their existence outside of the plasmasphere remains controversial. We present here the first definitive identification of a cavity mode outside the plasmasphere near the dawn flank, using simultaneous multi-spacecraft observations in the solar wind, the magnetosheath and the outer magnetosphere, as well as ground magnetometer data. Broadband solar wind dynamic pressure fluctuations are the most likely drivers of the Pc5 frequency range cavity mode.

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