Ionization balance in Titan's nightside ionosphere

Ionization balance in Titan's nightside ionosphere
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泰坦暗面电离层的电离平衡

DOI:
10.1016/j.icarus.2014.11.012
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发表时间:
2015-03
期刊:
影响因子:
3.2
通讯作者:
t K.
t K.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Vigren E.;Gal;M.;Yelle R. V.;Wellbrock A.;Coates A. J.;Snowden D.;Cui J.;Lavvas P.;Edberg N. J. T.;Shebanits O.;Wahlund J. -E.;Vuitton V.;M;t K.

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基于多仪器Cassini数据集,我们对等离子体数密度进行了模型与观测的比较,(neandnI分别是电子数密度和总正离子数密度)和短寿命离子数密度(N+,CH 2+,CH 3+,CH 4+)在土卫六的夜侧电离层的南半球的高度范围从1100和1200公里,从1100到1350公里,分别P模型假设光化学平衡、磁层电子沉淀和解离复合驱动的离子-电子对产生为等离子体中和的主要过程。该模型推导出短寿命离子数密度假设光化学平衡的短寿命离子,初级离子生产的电子碰撞电离的N2和CH 4和去除的短寿命离子通过与CH 4的反应。结果表明,该模型合理地再现观测,无论是关于tonP和短寿命离子的数密度。这与准确再现土卫六阳光照射下的电离层中的离子和电子数密度的困难形成对比。
Based on a multi-instrumental Cassini dataset we make model versus observation comparisons of plasma number densities,nP= (nenI)1/2(neandnIbeing the electron number density and total positive ion number density, respectively) and short-lived ion number densities (N+, CH2+, CH3+, CH4+) in the southern hemisphere of Titan’s nightside ionosphere over altitudes ranging from 1100 and 1200 km and from 1100 to 1350 km, respectively. ThenPmodel assumes photochemical equilibrium, ion–electron pair production driven by magnetospheric electron precipitation and dissociative recombination as the principal plasma neutralization process. The model to derive short-lived-ion number densities assumes photochemical equilibrium for the short-lived ions, primary ion production by electron-impact ionization of N2and CH4and removal of the short-lived ions through reactions with CH4. It is shown that the models reasonably reproduce the observations, both with regards tonPand the number densities of the short-lived ions. This is contrasted by the difficulties in accurately reproducing ion and electron number densities in Titan’s sunlit ionosphere.
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