Galileo evidence for rapid interchange transport in the Io torus
Galileo evidence for rapid interchange transport in the Io torus
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伽利略证据证明木卫一环面快速交换运输
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
M. Kivelson
中科院分区：
文献类型：
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作者：
R. Thorne;Thomas P. Armstrong;S. Stone;Donald J. Williams;R. Mcentire;Scott J. Bolton;D. Gurnett;M. Kivelson
伽利略粒子和场仪器在最初通过木卫一环的过程中检测到异常的等离子体特征。这些不寻常事件的特征是磁场的突然变化，宽带低频电磁波水平的增强以及高能粒子的通量和俯仰角各向异性的显著变化。在这里，我们对发生在6.03RJ附近的一个事件进行了协调研究，该事件发生在1995年12月7日17:34 UT之后。现有的数据与快速向内传输的概念一致，这被解释为预测木卫一轨道外区域交换运动的第一个证据。理论论证表明，交换磁通管的特点是等离子体密度大大降低，空间尺度可达10³km，向内径向速度可达10²km/s。
Anomalous plasma signatures were detected by the Galileo particles and fields instruments during the initial transit through the Io torus. These unusual events are characterized by abrupt changes in the magnetic field, enhanced levels of broadband low frequency electromagnetic waves and a pronounced change in both the flux and pitch angle anisotropy of energetic particles. Here we present a coordinated study of one of the events which occurred near 6.03RJ just after 17:34 UT on December 7, 1995. The available data are consistent with the concept of rapid inward transport, and this is interpreted as the first evidence for the predicted interchange motions in the region exterior to the orbit of Io. Theoretical arguments indicate that the interchanging flux tube is characterized by substantially reduced plasma density, a spatial scale comparable to 10³ km, and an inward radial velocity comparable to 10² km/s.