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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Surface charging of Saturn's plasma-absorbing moons
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Surface charging of Saturn's plasma-absorbing moons

机译：表面的土星plasma-absorbing收费卫星

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Recent results from the study of the interaction of Earth's moon with the solar wind have highlighted lunar surface charging as an important physical process not only for the local interaction of the surface and the impinging plasma but also for charged dust ejection and transport. Excluding Earth's moon, however, such studies have been limited to very few solar system bodies. Here we assess the importance of surface charging for the Saturnian plasma-absorbing moons. In this initial study, we focus on the various moons' trailing hemispheres and their variable charging patterns as a function of their magnetospheric local time. With only a few exceptions, our results indicate negative potentials for all moons, with the most extreme values predicted for Rhea. When the leading hemisphe re is partially sunlit,the surface potential profile can be quite complex with many different transition regions.We also find that electrostatic acceleration of dust is at least equally as (if not more) important as it is for Earth's moon for the submicron grains, but it is probably not sufficient to explain the detection of the larger micron-sized grains in the vicinity of the large moons of the outer planets. Regarding Saturn's asteroid-sized moons, we predict that electrostatic forces can accelerate grains above the escape velocity and populate the Saturnian system and/or contribute to dust transport across those moons' surfaces. On the basis of these results, we also propose several methods by which Cassini's instruments could be used to directly observe the effects of surface charging.
机译：最近的研究结果相互作用地球的月亮与太阳风突出显示月球表面作为收费重要的物理过程不仅为当地相互作用的表面和撞击等离子体也为带电尘埃弹射和交通工具。研究一直局限于很少的太阳能系统的身体。土星的表面充电plasma-absorbing卫星。专注于各种卫星的半球和他们的变量作为充电模式功能的磁性层的当地时间。只有少数例外,我们的结果表明-所有潜力的卫星,最多的土卫五的极端值预测。主要hemisphe部分阳光,表面电位剖面可以相当复杂与许多不同的过渡区域。发现静电加速度的尘埃至少同样(如果不是更多)重要月球是地球的亚微米颗粒,但这可能是不足以解释发现更大的微米大小的颗粒附近的大外的卫星行星。我们预测,静电力谷物在逃逸速度和加速填充的土星卫星系统和/或贡献尘埃运输跨越这些卫星的表面。基于这些结果,我们也建议卡西尼号的仪器的几种方法可用于直接观察到的影响表面充电。

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