Charge Dust distribution and Impact Map in Jovian Upper Atmosphere and Near Ring-Prediction for JUNO Mission
Kun-Cing PAN1*, Sean,Hsu2, Mihaly Horanyi2, Wing-Huen,Ip1,3,4
1Institute of Space Science, National Central University, Taoyuan, Taiwan
2Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA
3Institutes of Astronomy, National Central University, Taoyuan, Taiwan
4Space Science Institute, Macau University of Science and Technology, Macau, Macau
* presenting author:Kun-Cing Pan,
On July 4, 2016, the NASA JUNO spacecraft will enter into orbit around Jupiter. Its trajectories will carry JUNO to go through a narrow region between the planetary upper atmosphere and the Jovian rings at 1.06 Rj (Jovian radius). Such orbital profile will also provide a unique opportunity to measure the dust environment near Jupiter including micrometeroids and tiny grains produced by impact of interplanetary dust on the ring particles. Because of electrostatic charging by photoelectron emission and plasma interaction, dust grains of nano-size are subject to strong Lorentz force. In this study, the trajectories of charged nano-grains of different charge-to-mass ratios are traced by following their orbital motion in the Jovian magnetic fields. The three -dimensional density distributions and surface map of impact points of the nano-grains injected from the Jovian ring are constructed by Monte Carlo calculations. The numerical results will be compared to the JUNO dust detections.

Keywords: dust, jupiter, ring, charge