Meng-Tse Yang (Graduate Institute of Space Science, National Central University, Taoyuan City, Taiwan); Wing-Huen Ip (Graduate Institute of Space Science, National Central University, Taoyuan City, Taiwan; Graduate Institute of Astronomy, National Central University, Taoyuan City, Taiwan)
The narrow ringlet D68 with a width of 10 km and a radial distance of 67630 km from the center of Saturn has been considered to be the source of the tiny dust grains detected by the Cassini spacecraft during the ring plane crossings in its Proximal mission. Hedman (Icarus, 323, 62, 2019) gave a detailed analysis of the clumpy structures (T, M, L, LL) of D68 and their time evolution between Day 2016-071 and Day 2017-229.It was shown that the clumps would gradually disperse while drifting with a rate of 2 deg/yr to 8 deg/yr relative to the Keplerian rotating frame. In this study, we simulate the time evolution of a dust cloud of micron-sized particles under the influence of Lorentz force. We also compare the trajectories and orbital evolution of submicron grains ejected from the largest clump (M) with a view to produce a comprehensive picture of the inflows of ring material to the Saturnian atmosphere.