Abstract
When subject to Lomb periodogram analyses, fluxes of energetic electrons (27–496 keV) observed during the first 245 days of 2012 exhibit both mono and dual periods depending on energy. For E < 100 keV electrons, dual periods at 9.95 hours and 10.64 hours are evident, with the strongest signal at the shortest period. For higher energy electrons, only the period at 10.64 hours is evident. The 9.95 hour period is the shortest period ever measured for Saturn's magnetosphere, and is even shorter than the ∼10.5 hour period suggested by studies of Saturn's gravity field and cloud vorticity. If Saturn's magnetospheric periodicities are driven by ionospheric vortices, as suggested by some models, then their speeds would need to be super‐rotational to sustain the 9.95 hour period reported here.
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