Nonlinear standing shear Alfvén waves in the Earth's magnetosphere

Details Nonlinear standing shear Alfvén waves in the Earth's magnetosphere Nonlinear standing shear Alfvén waves in the Earth's magnetosphere

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921291r&link_type=abstract

Journal of Geophysical Research, Volume 99, Issue A11, p. 21291-21302

Physics

23

Magnetospheric Physics: Mhd Waves And Instabilities, Ionosphere: Polar Cap Ionosphere, Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Energetic Particles, Precipitating

Scientific paper

We present theory and numerical simulations of strong nonlinear effects in standing shear Alfvén waves (SAWs) in the Earth's magnetosphere, which is modeled as a finite size box with straight magnetic lines and (partially) reflecting boundaries. In a low β plasma it is shown that the ponderomotive force can lead to large-amplitude SAW spatial harmonic generation due to nonlinear coupling between the SAW and a slow magnetosonic wave. The nonlinear coupling leads to secularly growing frequency shifts, and in the case of driven systems, nonlinear dephasing can lead to saturation of the driven wave fields. The results are discussed in the context of their possible relevance to the theory of standing ionospheric cavity wave modes and field line resonances in the high-latitude magnetosphere.

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