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Ponderomotive saturation of magnetospheric field line resonances

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  • Compressional Alfvén waves in the terrestrial magnetospheric cavity constitute a discrete spectrum of global modes which can resonate with specific components of the continuum spectrum of shear Alfvén wave (SAW) field line resonant frequencies. We investigate the effect of the ponderomotive force (PF) of excited standing SAWs on the nonlinear saturation of field line resonances (FLRs). In low β plasmas FLR saturation occurs due to a nonlinear phase slip between the fast mode driver and SAW field. Ponderomotive forces also lead to density depletions at the ionospheres, nonlinear narrowing of the FLR and meridional scales comparable to those embedded within temporally modulated discrete auroral arcs. Observational features relating to these effects are discussed.

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    Article (Published)
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    © 1995 American Geophysical Union. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
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    • Rankin, Robert, Frycz, P., Tikhonchuk, Vladimir T., & Samson, John C. (1995). Ponderomotive saturation of magnetospheric field line resonances. Geophysical Research Letters, 22(13), 1741-1744.
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