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We study the vertical extent of propeller structures in Saturn's rings. Ourfocus lies on the gap region of the propeller and on non-inclined propellermoonlets. In order to describe the vertical structure of propellers we extendthe model of Spahn and Sremcevic (2000) to include the vertical direction. Wefind that the gravitational interaction of ring particles with the non-inclinedmoonlet does not induce considerable vertical excursions of ring particles, butcauses a considerable thermal motion in the ring plane. We expect ring particlecollisions to partly convert the lateral induced thermal motion into verticalexcursions of ring particles. For the gap region of the propeller, we calculategap averaged propeller heights on the order of 0.7 Hill radii, which is of theorder of the moonlet radius. In our model the propeller height decreasesexponentially until viscous heating and collisional cooling balance. Weestimate Hill radii of 370m and 615m for the propellers Earhart and Bleriot.Our model predicts about 120km for the azimuthal extent of the Earhartpropeller at Saturn's 2009 equinox, being consistent with values determinedfrom Cassini images.

Vertical structures induced by embedded moonlets in Saturn's rings: the gap region