Standing Alfvén waves at the magnetopause

Details Standing Alfvén waves at the magnetopause Standing Alfvén waves at the magnetopause

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3602104p&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 2, CiteID L02104

Physics

4

Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836)

Scientific paper

We present results from a statistical analysis of the oscillatory motion of the magnetopause based on THEMIS spacecraft observations, yielding the first experimental evidence for the existence of standing Alfvénic surface or Kruskal-Schwarzschild modes at the magnetopause. The magnetopause boundary represents a membrane under tension, which may resonantly interact with magnetospheric cavity or waveguide modes. Ultra-low ``magic'' geomagnetic pulsation frequencies, often observed in ground-based and ionospheric measurements and attributed to these cavity or waveguide modes, agree with the detected magnetopause oscillation frequencies and are reinterpreted in terms of surface mode eigenfrequencies.

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