标题： 帕克太阳探测器与类彗星物体近日点相遇：模型预测与测量 显示英文标题

标题： Encounter of Parker Solar Probe and a Comet-like Object During Their Perihelia: Model Predictions and Measurements

摘要： 帕克太阳探测器（PSP）旨在探索接近太阳的新生太阳风。同时，PSP 还有望遇到像彗星和小行星这样的小天体。在这项工作中，我们调查了星历表以寻找近期相遇的机会，然后模拟了释放出的尘埃等离子体与太阳风等离子体之间的相互作用。2019年9月2日，类似彗星的天体322P/SOHO刚刚经过近日点，飞行到距离太阳0.12天文单位的位置，并且与PSP的距离最近达到了0.025天文单位。我们展示了从322P释放出的尘粒的动力学特性，形成了弯曲的尘埃尾迹。沿着PSP在模拟内部日球层中的路径，我们采样并展示了等离子体和磁场的状态，其中模拟结果中的磁场序列直接与PSP的现场测量数据进行了比较。通过对比分析，我们认为322P在成为“岩石彗星”的过程中可能处于活动水平较低的状态，释放的尘埃等离子体有限。我们还展示了WISPR记录下的太阳风流图像，显示了图像叠加的混乱轨迹，表明存在尘埃轰击的迹象。我们观察到LASCO日冕仪显示322P在过近日点时正在从一个较暗区域向相对明亮的流线移动，并且模拟确认322P是从相对较快的太阳风流飞向较慢的太阳风流，从而改变这些流的局部等离子体状态。 显示英文摘要

摘要： Parker Solar Probe (PSP) aims at exploring the nascent solar wind close to the Sun. Meanwhile, PSP is also expected to encounter small objects like comets and asteroids. In this work, we survey the ephemerides to find a chance of recent encounter, and then model the interaction between released dusty plasmas and solar wind plasmas. On 2019 September 2, a comet-like object 322P/SOHO just passed its perihelion flying to a heliocentric distance of 0.12 au, and swept by PSP at a relative distance as close as 0.025 au. We present the dynamics of dust particles released from 322P, forming a curved dust tail. Along the PSP path in the simulated inner heliosphere, the states of plasma and magnetic field are sampled and illustrated, with the magnetic field sequences from simulation results being compared directly with the in-situ measurements from PSP. Through comparison, we suggest that 322P might be at a deficient activity level releasing limited dusty plasmas during its way to becoming a "rock comet". We also present images of solar wind streamers as recorded by WISPR, showing an indication of dust bombardment for the images superposed with messy trails. We observe from LASCO coronagraph that 322P was transiting from a dimming region to a relatively bright streamer during its perihelion passage, and simulate to confirm that 322P was flying from relatively faster to slower solar wind streams, modifying local plasma states of the streams.