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On day 138 of 2010, the plume of dust and gas emerging from Enceladus' SouthPolar Terrain passed between the Sun and the Cassini spacecraft. This solaroccultation enabled Cassini's Ultraviolet Imaging Spectrograph (UVIS) and theVisual and Infrared Mapping Spectrometer (VIMS) to obtain simultaneousmeasurements of the plume's gas and dust components along the same lines ofsight. The UVIS measurements of the plume's gas content are described in Hansenet al. (2011, GRL 38:11202) , while this paper describes the VIMS data and theinformation they provide about the plume's particle content. Together, the VIMSand UVIS measurements reveal that the plume material above Baghdad and Damascussulci has a dust-to-gas mass ratio that is roughly an order of magnitude higherthan the material above Alexandria and Cairo sulci. Similar trends in theplume's dust-to-gas ratio are also found in data obtained when Cassini flewthrough the plume in 2009, during which time the Ion and Neutral MassSpectrometer (INMS), Radio and Plasma Wave Science instrument (RPWS) and CosmicDust Analyzer (CDA) instruments made in-situ measurements of the plume's gasand dust densities (Dong et al. 2015 JGR 120:915-937). These and otherpreviously-published systematic differences in the material erupting fromdifferent fissures likely reflect variations in subsurface conditions acrossEncealdus' South Polar Terrain.

Spatial Variations in the Dust-to-Gas Ratio of Enceladus' Plume