| Summary: | 碩士 === 國立中央大學 === 太空科學研究所 === 104 === The orbital motion of charged nano-dust grains emitted from the Jovian rings is investigated. It is found that the combination of electrostatic charging and electromagnetic interaction can lead to a variety of circumplanetary non-Keplerian particle trajectories. Because of a combination of the Lorentz force and the Jovian gravitational attraction, the charged grains would impact Jupiter within a few to tens of hours. The impact points of dust grains with size larger than 100 nm are mostly distributed near the equatorial region while those of smaller sizes could reach mid-latitude due to magnetic field-aligned motion. If the mass injection rate is significant, the Jovian atmosphere might display signature of such ring rain effect.
We discuss in the dynamics of nano-size charged dust particle in the innermost Jovian magnetosphere. In our simulation, we use observing data to construct our dynamical model and also consider the charging process. Assuming small dust particle generate by continual meteoroid bombardment of the larger bodies. We build model to simulate how surface potential of small dust particles change in the Jovian plasma condition and transform orbit by Lorentz force. Finally we construct the impact map of nano-size particle impact with Jovian. And we use model to make prediction for the dust impact direction for compare with the JUNO mission, which is traverse this region in 2016.
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