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首页> 外文期刊>Geophysical Research Letters >Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
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Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock

机译：卡西尼号在土星的弓形冲击波中遇到类似热流异常的现象

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摘要

The first observations of the kronian equivalent of hot flow anomalies (HFAs) are presented. Using magnetic field and plasma data we discuss two events that were observed upstream of Saturn's bow shock during the first two orbits of the Cassini spacecraft. We suggest that these events result from the interaction between interplanetary current sheets and the shock surface. This same interaction is responsible for HFAs at the terrestrial bow shock. Calculations of electron temperature reveal an increase by a factor of approximately two for the first event, which is less than for terrestrial HFAs where the increase is by approximately an order of magnitude. In contrast to terrestrial HFAs we find that these events are associated with density enhancement rather than reduction. Estimates of the total pressure for the first event imply that the central region is expanding.
机译：提出了热流异常（HFA）的克朗等效值的第一个观测值。利用磁场和等离子体数据，我们讨论了在卡西尼号飞船的前两个轨道上，土星的弓形激波上游观测到的两个事件。我们建议这些事件是由于行星际电流板与激波表面之间的相互作用引起的。地面弓箭震击时，HFA也是这种相互作用。电子温度的计算表明，第一事件的增加幅度约为两倍，这比陆上HFA的增加幅度小一个数量级。与地面HFA相反，我们发现这些事件与密度增加而不是减少有关。估计第一个事件的总压力意味着中部地区正在扩大。

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