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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A Complete Data Set of Equatorial Projections of Saturn's Energetic Neutral Atom Emissions Observed by Cassini-INCA
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A Complete Data Set of Equatorial Projections of Saturn's Energetic Neutral Atom Emissions Observed by Cassini-INCA

机译：赤道的完整数据集的预测土星的高能中性原子的排放观察到Cassini-INCA

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Observations of energetic neutral atoms (ENAs) are a useful tool for analyzing ion and neutral abundances in planetary magnetospheres. They are created when hot plasma, originating for example from magnetic reconnection sites, charge-exchanges with the ambient neutral population surrounding the planet. The motion of ENAs is not governed by the magnetic field, allowing remote imaging. During the Cassini mission, the Ion and Neutral CAmera (INCA) of the Magnetosphere Imaging Instrument (MIMI) collected vast amounts of hydrogen and oxygen ENA observations of Saturn's magnetosphere from a variety of different viewing geometries. To enable investigations of the morphology and dynamics of Saturn's ring current, it is useful to re-bin and re-project the camera-like views from the spacecraft-based perspective into a common reference frame. We developed an algorithm projecting INCA's ENA observations into a regular grid in Saturn's equatorial plane. With most neutrals and ions being confined into an equatorial rotating disc, this projection is quite accurate in both spatial location and preservation of ENA intensity, provided the spacecraft is located at large enough elevations. Such projections were performed for all INCA ENA data from the Cassini Saturn tour; the data are available for download together with a Python routine flagging contaminated data and returning detailed spacecraft geometry information. The resulting data set is a good foundation for investigating for example the statistical properties of Saturn's ring current and its complicated dynamics in relation to other remote and in situ observations of, for example, auroral emissions and magnetotail reconnection events.
机译：观察高能中性原子(ENAs)一个有用的工具来分析离子和中性在行星不但丰度。热等离子体时创建,例如原始磁场重联的网站,charge-exchanges环境中立地球周围的人口。ENAs不是由磁场,允许远程成像。使命,离子和中性的相机(印加)磁气圈成像仪器(咪咪)收集大量的氢气和氧气ENA观察的土星磁层各种不同的几何图形。使形态和调查动力学土星的环电流,它是有用的re-bin re-project摄像机视图从spacecraft-based角度进入常见的参考系。印加ENA观察到常规的预测网格在土星的赤道平面上。中性和离子被限制到一个赤道旋转盘,这个投影很准确的空间位置和保护ENA强度,提供了飞船位于海拔足够大。这样的预测进行了印加ENA数据卡西尼号土星之旅;可以下载一个Python在一起常规萎靡不振的污染数据和返回详细的飞船几何信息。生成的数据集是一个很好的基础例如调查统计土星的环电流及其属性复杂的动力学与其他远程和原位观察,例如,极光排放和磁尾重新连接事件。

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