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Model analysis of Galileo electron densities on Jupiter

机译：木星上伽利略电子密度的模型分析

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A one-dimensional chemical-diffusive model of the Jovian ionosphere, in conjunction with measured upper atmospheric temperatures, is used to analyze the upper ionospheric electron densities on Jupiter measured by the Galileo RSS instrument on December 8, 1995. The analyses of these measurements have yielded quite different ionospheric properties at ingress and egress in terms of both the magnitude and the altitude of the peak electron density (n_e). At ingress, the peak n_e was approx. 10~5 cm~(-3) at an altitude of approx. 900 km. However, at egress the n_e peak was approx. 5 times smaller than at ingress and was located at approx. 1800 km altitude. As with our previous studies, we find it necessary to invoke a combination of vibrationally excited H_2 and vertical plasma flow to explain the measured ionospheric structure. the most interesting conclusion of this study is that a downward drift of plasma is required to fit the peak altitude of the ingress n_e profile. The direction of the vertical flow is most likely determined by the horizontal neutral wind. At egress, the situation is quite different because a strong field-aligned drift of 90 m/s, most likely caused by the meridional component of the neutral wind, is required to maintain the peak n_e at the measured altitude. The role of vibrationally excited H_2 in determining the magnitude of the measured n_e appears to be less important at ingress than at egress.
机译：利用木星的一维化学扩散模型，结合测得的最高大气温度，来分析1995年12月8日伽利略RSS仪测量的木星上的电离层电子密度。这些测量的分析包括在入口和出口产生的电离层特性在峰值电子密度（n_e）的大小和高度方面都大不相同。在入口处，峰值n_e约为。大约10〜5 cm〜（-3）的高度900公里。但是，在出口处，n_e峰约为。比入口小5倍，位于大约海拔1800公里。与我们以前的研究一样，我们发现有必要将振动激发的H_2和垂直等离子体流结合起来以解释所测量的电离层结构。这项研究最有趣的结论是，需要等离子向下漂移以适应入射n_e轮廓的峰值高度。垂直流的方向很可能由水平中性风确定。在出口，情况就大不相同了，因为需要90 m / s的强磁场对准漂移，这很可能是由中性风的子午分量引起的，才能将峰值n_e保持在测得的高度。振动激发的H_2在确定被测n_e的大小中的作用似乎在入口比在出口不那么重要。

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