泰提斯和迪奥尼作为土星磁层外流等离子体的来源
J L Burch1, J Goldstein, W S Lewis
1Southwest Research Institute, PO Drawer 28510, San Antonio, Texas 78228-0510, USA.
Nature
|June 15, 2007
概括
土星的快速旋转驱动了其磁层内的等离子体运动. 观测显示出向外的等离子体流,支持离心交换理论,并将其与月球相关的等离子体电流联系起来.
科学领域:
- 太空物理空间物理学
- 星球科学 星球科学
- 磁动力学是一种磁动力学.
背景情况:
- 土星的磁层旋转速度快,是地球速度的两倍以上.
- 预计离心力将冷,密集的等离子体向外抛出,被更热的等离子体取代.
- 这种离心交换是在木星磁层中预测和观察到的.
研究的目的:
- 为了研究土星磁层中的等离子体动力学.
- 确认土星上的离心交换机制.
- 分析与等离子注射有关的电子角分布.
主要方法:
- 分析电子速度向量和磁场向量的角分布.
- 观察热等离子体注射区域附近的冷,密集的等离子体.
- 与磁层等离子体传输的理论模型进行比较.
主要成果:
- 观察到的斜角分布表明了向外的等离子体流.
- 数据与土星磁层中的离心交换相一致.
- 双峰 ("蝶") 斜角分布表明来自迪翁和泰提斯地区的等离子体运输.
结论:
- 这些发现支持土星磁层的离心交换模型.
- 与Dione和Tethys等卫星相关的明显的等离子体 tori得到了支持.
- 电子角分布提供了磁层等离子体循环模式的证据.
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