Charged nanograins in the Enceladus plume
Charged nanograins in the Enceladus plume
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土卫二羽流中的带电纳米颗粒
DOI：
10.1029/2011ja017218
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发表时间：
2011
影响因子：
--
通讯作者：
M. Horányi
中科院分区：
文献类型：
--
作者：
T. Hill;M. Thomsen;Robert L. Tokar;A. Coates;G. Lewis;D. Young;F. Crary;R. Baragiola;Robert E. Johnson;Y. Dong;R. Wilson;G. Jones;J. Wahlund;D. Mitchell;M. Horányi
[1]卡西尼号曾三次与土卫二南极喷发的羽流相遇，卡西尼号等离子体光谱仪（CAPS）曾在航天器撞击方向观察过。在每一种情况下，CAPS都探测到了一个冷密度的重带电粒子群，其质荷比（m/q）高达CAPS可探测到的最大值（104 amu/e）。这些粒子被解释为单电荷纳米大小的水冰粒。虽然它们被检测到具有负净电荷和正净电荷，但前者的数量大大超过后者，至少在CAPS可获得的m/q范围内。在最遥远的遭遇（E3，2008年3月），我们得出了一个净（负）电荷密度高达2600 e/cm 3的纳米颗粒，远远超过周围的等离子体数密度，但小于净（正）电荷密度推断从RPWS朗缪尔探测数据在同一羽遭遇。对三次现有遭遇的CAPS数据进行比较，与纳米颗粒使表面喷口基本上不带电的想法一致，但随着它们远离卫星，等离子体电子撞击使它们变得越来越负电荷。这些纳米颗粒为磁层等离子体和E环材料提供了潜在的潜在来源。
[1] There have been three Cassini encounters with the south-pole eruptive plume of Enceladus for which the Cassini Plasma Spectrometer (CAPS) had viewing in the spacecraft ram direction. In each case, CAPS detected a cold dense population of heavy charged particles having mass-to-charge (m/q) ratios up to the maximum detectable by CAPS (∼104 amu/e). These particles are interpreted as singly charged nanometer-sized water-ice grains. Although they are detected with both negative and positive net charges, the former greatly outnumber the latter, at least in the m/q range accessible to CAPS. On the most distant available encounter (E3, March 2008) we derive a net (negative) charge density of up to ∼2600 e/cm3 for nanograins, far exceeding the ambient plasma number density, but less than the net (positive) charge density inferred from the RPWS Langmuir probe data during the same plume encounter. Comparison of the CAPS data from the three available encounters is consistent with the idea that the nanograins leave the surface vents largely uncharged, but become increasingly negatively charged by plasma electron impact as they move farther from the satellite. These nanograins provide a potentially potent source of magnetospheric plasma and E-ring material.
土卫二羽流中的负离子
影响因子：
3.2
作者：
Coates A
通讯作者：
Coates A
带负电的羽流颗粒和半球耦合电流对土卫二阿尔文翼结构的影响：卡西尼号磁力计观测的分析模型
影响因子：
--
作者：
Kriegel;Neubauer;Motschmann;Dougherty
通讯作者：
Dougherty