Large-<formula>m waves generated by small-<formula>m field line resonances via the nonlinear Kelvin-Helmholtz instability

Details Large-<formula>m waves generated by small-<formula>m field line resonances via the nonlinear Kelvin-Helmholtz instability Large-<formula>m waves generated by small-<formula>m field line resonances via the nonlinear Kelvin-Helmholtz instability

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10219927a&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A9, p. 19927-19934

Physics

Plasma Physics

20

Magnetospheric Physics: Mhd Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Waves And Instabilities

Scientific paper

Recently, ultralow-frequency waves with large azimuthal wavenumber (large m) have been observed on similar L shells and with the same (or similar) frequencies as small-m field line resonances (FLRs). The large-m waves appeared to the west of the small-m FLRs and had westward phase propagation while the small-m FLRs had tailward phase propagation. We propose an extension to an earlier waveguide model to explain these observations. We suggest that small-m tailward propagating waveguide modes drive the small-m FLRs. Phase mixing within these FLRs allows the development of the nonlinear Kelvin-Helmholtz (K-H) instability near the resonant field lines. Phase-mixing scale lengths are limited by ionospheric dissipation, and we show that realistic ionospheric Pedersen conductivities result in the dominance of a single zero-frequency K-H wave in each small-m FLR region having m consistent with observation of the large-m disturbances. K-H growth rates are significant, but not large enough to disrupt the small-m FLRs. We propose that unstable ion distributions amplify the seed K-H waves as the ions drift westward. This leads to observable large-m drift waves at or beyond the westward limits of the small-m FLR regions.

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