Tidal control of jet eruptions on Enceladus as observed by Cassini ISS between 2005 and 2007

Observations of Enceladus have revealed active jets of material erupting from cracks on its south polar surface. It has previously been proposed that diurnal tidal stress, driven by Enceladus’ orbital eccentricity, may actively produce surface movement along these cracks daily and thus may regulate when eruptions occur. Our analysis of the stress on jet source regions identified in Cassini ISS images reveals tidal stress as a plausible controlling mechanism of jet activity. However, the evidence available in the published and preliminary observations of jet activity between 2005 and 2007 may not be able to solidify the link between tidal stress and eruptions from fissures. Ongoing, far more comprehensive analyses based on recent, much higher resolution jetting observations have the potential to prove otherwise.

► We place observations of jet activity from 2005–2007 into Enceladus’ orbital context. ► We examine the diurnal tidal stress at locations associated with jet activity. ► Possible mechanisms of jet control by tidal stress are identified. ► Favorable stress conditions exist which can establish links to subsurface volatiles.