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首页> 外文期刊>Planetary and space science >Negative ion densities in the ionosphere of Titan-Cassini RPWS/LP results
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Negative ion densities in the ionosphere of Titan-Cassini RPWS/LP results

机译：Titan-Cassini RPWS / LP电离层中的负离子密度

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摘要

The Cassini spacecraft Radio and Plasma Wave Science (RPWS) Langmuir Probe (LP) provides in-situ measurements of Titan's ionosphere. We present here data from 47 deep flybys in the time period October 2004-July 2012 of charge densities of positive and negative ions as well as electrons. These densities have been mapped with respect to altitude and solar zenith angle (SZA) in an altitude range of 880-1400 km. The inferred electron number densities are consistent with earlier presented observational results. Negative ion charge densities exhibit a trend that exponentially increases towards lower altitudes within the covered altitude range. This is especially evident on the nightside of Titan (SZA > 110°). The negative ion charge densities at the lowest traversed altitudes (near 960 km) are inferred to be in the range 300-2500 cm~(-3). The results show that very few free electrons (n_e_i-0.1-0.7) exist in the deepest regions (880-1050 km) of Titan's nightside ionosphere. Instead the deep nightside part of Titan's ionosphere is dominated by both negatively and positively charged heavy (> 100 amu) organic ions. We therefore believe a dust/aerosol-ion plasma exists here, similar to what is found in noctilucent clouds in Earth's mesosphere.
机译：卡西尼号航天器无线电和等离子波科学（RPWS）Langmuir探测器（LP）可对泰坦电离层进行原位测量。我们在这里提供了2004年10月至2012年7月这段时间内47次深飞越的数据，这些数据是正离子和负离子以及电子的电荷密度。这些密度已针对880-1400 km高度范围内的海拔高度和太阳天顶角（SZA）进行了绘制。推断的电子数密度与先前提出的观测结果一致。负离子电荷密度呈现出一种趋势，即在覆盖的海拔范围内朝着较低的海拔呈指数增长。这在泰坦（SZA> 110°）的夜晚尤为明显。推算出最低移动高度（960 km附近）的负离子电荷密度在300-2500 cm〜（-3）范围内。结果表明，在泰坦夜空电离层最深的区域（880-1050 km）中几乎没有自由电子（n_e / n_i-0.1-0.7）。取而代之的是，泰坦电离层深层的深夜部分被带负电和带正电的重（> 100 amu）有机离子所控制。因此，我们认为这里存在尘埃/气溶胶离子等离子体，类似于在地球中层夜光云中发现的等离子体。

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  • 来源
    《Planetary and space science》 |2013年第8期|153-162|共10页
  • 作者

    O. Shebanits; J.-E. Wahlund; K. Mandt; K. Agren; N.J.T. Edberg; J.H. Waite Jr;

  • 作者单位

    Department of Physics and Astronomy, Uppsala University, Box 516, SE 751 20 Uppsala, Sweden,Swedish Institute of Space Physics, Box 537, SE 751 21 Uppsala, Sweden;

    Swedish Institute of Space Physics, Box 537, SE 751 21 Uppsala, Sweden;

    Space and Science Engineering Division, Southwest Research Institute (SWR1), 6220 Culebra Road, San Antonio, TX 78238, USA;

    Swedish Institute of Space Physics, Box 537, SE 751 21 Uppsala, Sweden;

    Swedish Institute of Space Physics, Box 537, SE 751 21 Uppsala, Sweden;

    Space and Science Engineering Division, Southwest Research Institute (SWR1), 6220 Culebra Road, San Antonio, TX 78238, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titan; Ionospheric physics; Cassini; Negative ions; Dust-plasma interaction;

    机译：泰坦电离层物理学;卡西尼号;负离子;粉尘-血浆相互作用;

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