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首页> 外文期刊>Annales Geophysicae >Iterative inversion of global magnetospheric ion distributions using energetic neutral atom (ENA) images recorded by the NUADU/TC2 instrument
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Iterative inversion of global magnetospheric ion distributions using energetic neutral atom (ENA) images recorded by the NUADU/TC2 instrument

机译:使用NUADU / TC2仪器记录的高能中性原子(ENA)图像对全球磁层离子分布进行迭代反演

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摘要

A method has been developed for extracting magnetospheric ion distributions from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on a constrained linear inversion, this iterative technique is suitable for use in the case of an ENA image measurement, featuring a sharply peaked spatial distribution. The method allows for magnetospheric ion distributions to be extracted from a low-count ENA image recorded over a short integration time (5 min). The technique is demonstrated through its application to a set of representative ENA images recorded in energy Channel 2 (hydrogen: 50-81 keV, oxygen: 138-185 keV) of the NUADU instrument during a geomagnetic storm. It is demonstrated that this inversion method provides a useful tool for extracting ion distribution information from ENA data that are characterized by high temporal and spatial resolution. The recovered ENA images obtained from inverted ion fluxes match most effectively the measurements made at maximum ENA intensity.
机译:已经开发出一种方法,用于从N-2型航天器上的NUADU仪器进行的高能中性原子(ENA)测量中提取磁层离子分布。基于受约束的线性反演,此迭代技术适用于ENA图像测量的情况,其特征是具有急剧峰值的空间分布。该方法允许从在短积分时间内(5分钟)记录的低计数ENA图像提取磁层离子分布。通过将该技术应用于在地磁风暴期间NUADU仪器的能量通道2(氢:50-81 keV,氧气:138-185 keV)中记录的一组代表性ENA图像,证明了该技术。证明了这种反演方法为从具有高时空分辨率的ENA数据中提取离子分布信息提供了有用的工具。从反向离子通量获得的恢复的ENA图像最有效地匹配了在最大ENA强度下进行的测量。

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