Frequency doubling in ultralow frequency wave signals

Details Frequency doubling in ultralow frequency wave signals Frequency doubling in ultralow frequency wave signals

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10227151s&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A12, p. 27151-27158

Physics

Plasma Physics

10

Magnetospheric Physics: Forecasting, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities

Scientific paper

We report a new theory to explain the long-observed frequency-doubling phenomenon detected in the compressional component of ``high-m'' ultralow-frequency signals seen in the Earth's magnetosphere. We show that the effect is a nonlinear response directly associated with resonant particles. The phase relationship observed between the linear signal and the nonlinear frequency-doubled signal is predicted by the theory. Our explanation and the fit with observation mean that the occurrence of frequency doubling provides critical evidence of the fact that ring current particles drive high-m waves.

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