Iterative inversion of global magnetospheric information from energy neutral atom (ENA) images recorded by the TC-2/NUADU instrument

Iterative inversion of global magnetospheric information from energy neutral atom (ENA) images recorded by the TC-2/NUADU instrument
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根据 TC-2/NUADU 仪器记录的能量中性原子 (ENA) 图像迭代反演全球磁层信息

DOI:
10.1007/s11431-008-0264-9
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发表时间:
2008-09
期刊:
Chin. Sci.
影响因子:
--
通讯作者:
路立
路立
中科院分区:
其他
文献类型:
--
作者:
路立

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提出了一种利用TC-2航天器上NUADU仪器的高能中性原子(ENA)测量数据反演磁层离子分布的方法。在已有的约束线性反演方法的基础上,发展了一种适用于低计数ENA测量的迭代方法,该方法对噪声背景具有一定的容忍能力。利用迭代技术,首次实现了磁层离子分布和外大气中性密度的同时反演,并进而实现了全球ENA辐射的三维反演。该技术被应用到一个代表性的ENA图像记录在能量通道2(质子:50-81千电子伏)的NUADU仪器在一个主要的地磁风暴,它是,从而表明,开发的检索方法提供了一个有用的工具,从ENA数据中提取离子分布信息。
A method is presented for retrieving the magnetospheric ion distribution from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on the already well-established method of constrained linear inversion, an iterance technique suitable for the low count ENA measurements has been developed which is tolerant of the noise background. By the iterance technique, it is possible for the first time to simultaneously retrieve the magnetospheric ion distribution and the exospheric neutral density, and further to recover global ENA emissions in three dimensions. The technique is applied to a representative ENA image recorded in energy channel 2 (protons: 50–81 keV) of the NUADU instrument during a major geomagnetic storm and it is, thereby, shown that the retrieval method developed provides a useful tool for extracting ion distribution information from ENA data.
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