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首页> 外文期刊>Geophysical Research Letters >Spatial distribution of low-energy plasma around comet 67P/CG from Rosetta measurements
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Spatial distribution of low-energy plasma around comet 67P/CG from Rosetta measurements

机译：罗塞塔观测资料显示67P / CG彗星周围低能等离子体的空间分布

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摘要

We use measurements from the Rosetta plasma consortium Langmuir probe and mutual impedance probe to study the spatial distribution of low-energy plasma in the near-nucleus coma of comet 67P/Churyumov-Gerasimenko. The spatial distribution is highly structured with the highest density in the summer hemisphere and above the region connecting the two main lobes of the comet, i.e., the neck region. There is a clear correlation with the neutral density and the plasma to neutral density ratio is found to be approximate to 1-210(-6), at a cometocentric distance of 10km and at 3.1AU from the Sun. A clear 6.2h modulation of the plasma is seen as the neck is exposed twice per rotation. The electron density of the collisionless plasma within 260km from the nucleus falls off with radial distance as approximate to 1/r. The spatial structure indicates that local ionization of neutral gas is the dominant source of low-energy plasma around the comet.
机译：我们使用来自Rosetta血浆联盟Langmuir探针和互阻抗探针的测量值来研究低能等离子体在彗星67P / Churyumov-Gerasimenko的近核昏迷中的空间分布。空间分布高度结构化，在夏季半球中以及在连接彗星的两个主要裂片的区域（即颈部区域）之上的密度最高。与中性密度有明显的相关性，在距太阳10 km的彗心距离和距太阳3.1AU处，发现等离子体与中性密度之比约为1-210（-6）。由于颈部每转暴露两次，因此可以看到清晰的6.2h血浆调制。距原子核260公里以内的无碰撞等离子体的电子密度随径向距离（大约1 / r）下降。空间结构表明，中性气体的局部电离是彗星周围低能等离子体的主要来源。

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