An inner magnetospheric vortex as the source of periodicities in Saturn's magnetosphere

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Scientific paper

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Scientific paper

In this work, we show that the modulations of SKR emissions and many field and plasma parameters are the manifestations of a massive (M > 108 kg) slowmoving (V < 1.5 km/s) two-cell plasma convection system operating in the inner magnetosphere of Saturn that was first proposed by Gurnett et al. [1]. We show that during the southern summer the longer-period southern SKR emissions are exclusively excited by sources in the plasma outflow region of the convection system which lags corotation to conserve angular momentum. The two key components of Saturn's summer clock are the unequal conductivities of the northern and the southern hemispheres from differences in solar insolation and a plasma convection cycle that provides persistent memory to the magnetosphere. We illustrate, how, various field and plasma parameters synchronize themselves to Saturn's

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