We present observations of significant dynamics within two UV auroral storms observed
on Saturn using the Hubble Space Telescope in April/May 2013. Specifically, we discuss bursts of auroral
emission observed at the poleward boundary of a solar wind-induced auroral storm, propagating at ∼330%
rigid corotation from near ∼01 h LT toward ∼08 h LT. We suggest that these are indicative of ongoing, bursty
reconnection of lobe flux in the magnetotail, providing strong evidence that Saturn’s auroral storms are
caused by large-scale flux closure. We also discuss the later evolution of a similar storm and show that the
emission maps to the trailing region of an energetic neutral atom enhancement. We thus identify the auroral
form with the upward field-aligned continuity currents flowing into the associated partial ring current.