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Abstract
AbstractThe role of Z‐mode emission in the diffusive scattering and resonant acceleration of electrons is believed to be important at Saturn. A survey of the “5 kHz” component of this emission at Saturn earlier reported strong intensity in the lower density regions where the ratio of plasma frequency to cyclotron frequency, fp/fc < 1. At Saturn this occurs along the inner edge of the Enceladus torus near the equator and at higher latitudes. Using the Cassini Radio and Plasma Wave Science instrument observations during the Cassini proximal orbits, we have now identified these emissions extending down to and within the ionosphere. Wave polarization measurements and unique frequency cutoffs are used to positively identify the wave mode. Analogous to the role of whistler mode chorus at Earth, Saturn Z‐mode emissions may interact with electrons contributing to the filling or depleting of Saturn's inner radiation belts.
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