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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Cassini in Titan's tail: CAPS observations of plasma escape
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Cassini in Titan's tail: CAPS observations of plasma escape

机译：卡西尼号在泰坦的尾巴:帽子的观察等离子体逃逸

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摘要

We present observations of CAPS electron and ion spectra during Titan distant tail crossings at 5,000-10,000 km altitude by the Cassini spacecraft. In common with closer tail encounters, we identify ionospheric plasma in the tail. Some of the electron spectra indicate a direct magnetic connection to Titan's dayside ionosphere due to the presence of ionospheric photoelectrons. Ion observations reveal heavy (m/q～16 and 28) and light (m/q = 1-2) ion populations streaming into the tail. Using the distant tail encounters T9, T75 and T63, we estimate total plasma loss rates from Titan via this process of (4.2, 0.96 and 2.3) × 10~(24) ions s-1 respectively for the three encounters, values which are in agreement with some simulations but slightly lower than earlier estimates based on non-differential techniques. Using the mass-separated data, this corresponds to mass loss rates of (8.9, 1.6, 4.0) × 10~(25) amu S~(-1) for T9, T75 and T63 respectively, an average loss rate of ～7 tonnes per Earth day. Remarkably, all of the tail encounters studied here indicate a split tail feature, indicating that this may be a common feature in Titan's interaction with Saturn's magnetosphere.
机译：我们现在观察帽电子和离子光谱在泰坦遥远的尾巴口岸由卡西尼号5000 - 10000公里的高度宇宙飞船。遇到,我们确定电离层等离子体的尾巴。直接磁性连接泰坦的光面电离层由于电离层的存在光电子。(m / q ~ 16 - 28)和光(m / q = 1 - 2)离子人群涌向尾。遥远的尾巴遇到T9, T75 T63,血压得到较好的控制估计总泰坦通过等离子体损失比例这个过程(4.2、0.96和2.3)×10 ~ (24)离子s - 1分别三次,与一些值的协议模拟但略低于早些时候基于non-differential估计技术。使用mass-separated数据,这对应大规模的亏损率(8.9,1.6,4.0)×10 ~ (25)阿姆S ~ (1) T9, T75和T63血压得到较好的控制的平均损失率~ 7吨地球日。值得注意的是,所有的尾巴遇到研究这表明分裂尾特征,指示这可能是在泰坦的共同特征与土星的磁场。

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