论文标题
灰尘冲击电压签名对Parker太阳能探针的签名：航天器浮动潜力的影响
Dust impact voltage signatures on Parker Solar Probe: influence of spacecraft floating potential
论文作者
论文摘要
当快速灰尘撞击航天器时，它会产生一团等离子体，其中一些会逸入太空，而瞬时的电荷不平衡散布了航天器电压相对于等离子体。电子在离子之前竞争，但是两者都对航天器的直流电场做出了反应。如果航天器的电势相对于等离子体为正，则应吸引尘埃云电子并驱除离子，反之亦然。在这里，我们使用来自灰尘影响的冲动电压信号的测量值对Parker太阳能探头（PSP）航天器的影响表明，峰值电压振幅与航天器浮动电位明显相关，与理论模型和实验室测量一致。此外，我们检查了与电压波形相关的一些时间尺度，并与航天器充电物理学的时间尺度进行比较。
When a fast dust particle hits a spacecraft, it generates a cloud of plasma some of which escapes into space and the momentary charge imbalance perturbs the spacecraft voltage with respect to the plasma. Electrons race ahead of ions, however both respond to the DC electric field of the spacecraft. If the spacecraft potential is positive with respect to the plasma, it should attract the dust cloud electrons and repel the ions, and vice versa. Here we use measurements of impulsive voltage signals from dust impacts on the Parker Solar Probe (PSP) spacecraft to show that the peak voltage amplitude is clearly related to the spacecraft floating potential, consistent with theoretical models and laboratory measurements. In addition, we examine some timescales associated with the voltage waveforms and compare to the timescales of spacecraft charging physics.
