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Rotational modulation of Saturn Kilometric Radiation, narrrowband emission and auroral hiss

    S.-Y. YE, G. FISCHER, W. S. KURTH, J. D. MENIETTI, D. A. GURNETT

Planetary Radio Emissions VIII, pp. 191-204, 2018/08/16

Proceedings of the 8th International Workshop on Planetary, Solar and Heliospheric Radio Emissions held at Seggauberg near Graz, Austria, October 25–27, 2016

doi: 10.1553/PRE8s191

doi: 10.1553/PRE8s191

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doi:10.1553/PRE8s191



doi:10.1553/PRE8s191

Abstract

Despite the axisymmetry of Saturn’s internal magnetic field, a variety of magnetospheric properties and radio emissions exhibit periodic modulations due to Saturn’s rotation. Previous studies have shown that Saturn kilometric radiation (SKR) and auroral hiss have two different modulation rates, one associated with each hemisphere, which also vary over the time scale of a Saturn year. The narrowband emissions exhibit dual periodicities in each hemisphere. We update the modulation analysis of Saturn’s radio emissions to the end of year 2016. It is shown that the northern SKR rotation slowed to around 800°/day in 2016, while the south remained around 809°/day as of late 2015 (no clear rotation signal for southern SKR in 2016). When Cassini shifted to high inclination orbits at the end of 2016, a single modulation signal of the narrowband emission showed up around 800°/day. A rotational modulation signal for northern auroral hiss also showed up around 800°/day, but there was no signal for the southern auroral hiss.