Enceladus' Varying Imprint on the Magnetosphere of Saturn
Enceladus' Varying Imprint on the Magnetosphere of Saturn
复制标题
土星磁层上土卫二的不同印记
DOI：
10.1126/science.1121011
复制
发表时间：
2006
期刊：
影响因子：
56.9
通讯作者：
M. Dougherty
中科院分区：
文献类型：
--
作者：
G. Jones;E. Roussos;N. Krupp;C. Paranicas;J. Woch;A. Lagg;D. Mitchell;S. Krimigis;M. Dougherty
>20 千电子伏磁层粒子对土星卫星土卫二的轰击导致与其轨道磁连接的区域中的粒子通量耗尽。无论磁层活动如何，质子损耗都是持续存在的，而电子损耗很快就会被磁层过程消除。卡西尼号磁层成像仪器对这些特征的观测可以远程监测土卫二的气体和尘埃环境。这揭示了月球上巨大的排气变化，并表明其拉格朗日点的尘埃浓度增加。粒子耗尽的特性还提供了高能电子的关键径向扩散系数以及内部磁层旋转速度的独立测量。
The bombardment of Saturn's moon Enceladus by >20–kiloelectron volt magnetospheric particles causes particle flux depletions in regions magnetically connected to its orbit. Irrespective of magnetospheric activity, proton depletions are persistent, whereas electron depletions are quickly erased by magnetospheric processes. Observations of these signatures by Cassini's Magnetospheric Imaging Instrument allow remote monitoring of Enceladus' gas and dust environments. This reveals substantial outgassing variability at the moon and suggests increased dust concentrations at its Lagrange points. The characteristics of the particle depletions additionally provide key radial diffusion coefficients for energetic electrons and an independent measure of the inner magnetosphere's rotation velocity.