The Juno spacecraft entered orbit at Jupiter on 5 July 2016. Since then, Juno has orbited Jupiter in high inclination orbits, crossing the ring plane near perijove. During 20 of the first 21 crossings, the Waves instrument detected signals associated with dust impacts. The impact rate profiles show peaks of order 6 s⁻¹ around the ring plane with half width at half maximum ~2,000–3,000 km. The polarity ratio of the impact signals did not follow the areas of the antennas exposed to dust impacts that change due to the rotation of the spacecraft, suggesting Waves detects impacts on the Juno spacecraft and not just on the Waves antennas. The impact rate profile changed during Perijove 19, when the spacecraft rotation axis was tilted to the south, increasing the area of the solar panels exposed to impacts, indicating that the detected impacts were on the spacecraft body. Grain sizes of order 1 μm are estimated, and the differential size distribution has a slope of −5.1 and with number densities of order 3 × 10⁻⁶ m⁻³.

中文翻译：

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朱诺波探测木星附近的尘埃影响

朱诺号航天器于2016年7月5日进入木星轨道。此后，朱诺号以高倾角轨道在木星轨道上运行，越过了近圆点附近的环形飞机。在前21次穿越中的20次穿越期间，Waves仪器检测到与尘埃撞击相关的信号。冲击速率曲线显示了6 s ^-1阶的峰值围绕环形平面，最大半宽度为一半，最大约为2,000-3,000公里。撞击信号的极性比并未跟随暴露于尘埃撞击的天线区域，尘埃撞击会由于航天器的旋转而发生变化，这表明Waves能够检测到对Juno航天器的撞击，而不仅仅是对Waves天线的撞击。在Perijove 19期间，当航天器旋转轴向南倾斜时，撞击率曲线发生了变化，从而增加了受到撞击的太阳能电池板的面积，表明检测到的撞击在航天器主体上。估计晶粒尺寸为1μm左右，并且微分尺寸分布的斜率为-5.1且数密度为3×10 ^-6  m ^-3。