Fine jet structure of electrically charged grains in Enceladus' plume
Fine jet structure of electrically charged grains in Enceladus' plume
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DOI：
10.1029/2009gl038284
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发表时间：
2009-08-29
影响因子：
5.2
通讯作者：
Magee, B. A.
中科院分区：
文献类型：
--
作者：
Jones, G. H.;Arridge, C. S.;Magee, B. A.
通过穿越土星卫星土卫二南部高纬度地区喷发的羽流，卡西尼号轨道飞行器仪器可以直接对其中的物质进行采样。卡西尼等离子体光谱仪（CAPS）的数据显示，一个主要的羽流成分包括以前未被探测到的纳米尺度和更大的颗粒，这些颗粒弥合了以前观察到的气态物质和固态冰粒之间的质量差距。该群体既带负电又带正电，表明表面下摩擦带电，即，冷凝羽流材料的接触带电可通过喷口内的相互碰撞而发生。土星磁层的电场控制着喷流的形态，根据质量和电荷分离粒子。这些粒子的空间分布的精细结构与离散羽流射流的来源相关，并揭示了其他可能的活动区域的位置。观测到的羽流人口可能形成了土星磁层外检测到的高速纳米粒子流的主要组成部分。引文：琼斯，G。H、等人（2009年），土卫二羽流中带电颗粒的精细喷射结构，地球物理学。保留信函：36，L16204，doi：10.1029/2009GL038284。
By traversing the plume erupting from high southern latitudes on Saturn's moon Enceladus, Cassini orbiter instruments can directly sample the material therein. Cassini Plasma Spectrometer, CAPS, data show that a major plume component comprises previously-undetected particles of nanometer scales and larger that bridge the mass gap between previously observed gaseous species and solid icy grains. This population is electrically charged both negative and positive, indicating that subsurface triboelectric charging, i.e., contact electrification of condensed plume material may occur through mutual collisions within vents. The electric field of Saturn's magnetosphere controls the jets' morphologies, separating particles according to mass and charge. Fine-scale structuring of these particles' spatial distribution correlates with discrete plume jets' sources, and reveals locations of other possible active regions. The observed plume population likely forms a major component of high velocity nanometer particle streams detected outside Saturn's magnetosphere. Citation: Jones, G. H., et al. (2009), Fine jet structure of electrically charged grains in Enceladus' plume, Geophys. Res. Lett., 36, L16204, doi:10.1029/2009GL038284.