Spectroscopic Diagnostic of Halos and Elves Detected From Space‐Based Photometers
Spectroscopic Diagnostic of Halos and Elves Detected From Space‐Based Photometers
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DOI：
10.1029/2018jd029053
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发表时间：
2018-11
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通讯作者：
F. J. Pérez-Invernón;A. Luque;F. Gordillo‐Vázquez;M. Sato;T. Ushio;T. Adachi;A. Chen
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作者：
F. J. Pérez-Invernón;A. Luque;F. Gordillo‐Vázquez;M. Sato;T. Ushio;T. Adachi;A. Chen
在这项工作中，我们开发了两种光谱诊断方法来推导的峰值约化电场在瞬态发光事件（TLEs）从他们的光学信号。这些方法可用于分析大气-空间相互作用监测器（欧洲航天局）等航天器报告的TLE的光学特征，以及未来的用于分析来自LightNIngs和Sprites的辐射的工具（国家空间研究中心）。作为这些方法的第一次验证，我们将它们应用于预测（合成）的光学签名的晕和精灵，两种类型的TLEs，从电动力学模型。这一过程使我们能够比较峰值约化电场的推断值与由晕和elve模型计算的值。随后，我们将这两种方法分别应用于全球照明和精灵测量（日本宇宙航空研究开发机构）以及精灵和高层大气闪电成像仪（国家航天组织）航天器报告的精灵和光环的光学特征分析。我们认为，估算晕和精灵中最大约化电场的最佳发射比是N2的第二正系统与N2+的第一负系统（FNS）之比、N2的第一正系统与N2+的FNS之比以及N2的莱曼-伯奇-霍普菲尔德带与N2+的FNS之比。在约化电场低于150 Td的情况下，我们发现N2的第二正系统与N2的第一正系统的比值也可以用来合理地估计电场的大小。最后，我们表明，报告的光信号精灵可以处理以下的反演方法，以估计一些特征的父闪电。
In this work, we develop two spectroscopic diagnostic methods to derive the peak reduced electric field in transient luminous events (TLEs) from their optical signals. These methods could be used to analyze the optical signature of TLEs reported by spacecraft such as Atmosphere‐Space Interactions Monitor (European Space Agency) and the future Tool for the Analysis of RAdiations from lightNIngs and Sprites (Centre National d'Études Spatiales). As a first validation of these methods, we apply them to the predicted (synthetic) optical signatures of halos and elves, two types of TLEs, obtained from electrodynamical models. This procedure allows us to compare the inferred value of the peak reduced electric field with the value computed by halo and elve models. Afterward, we apply both methods to the analysis of optical signatures of elves and halos reported by Global LIghtning and sprite MeasurementS (Japan Aerospace Exploration Agency) and Imager of Sprites and Upper Atmospheric Lightning (National Space Organization) spacecraft, respectively. We conclude that the best emission ratios to estimate the maximum reduced electric field in halos and elves are the ratio of the second positive system of N2 to first negative system (FNS) of N 2+ , the first positive system of N2 to FNS of N 2+ and the Lyman‐Birge‐Hopfield band of N2 to FNS of N 2+ . In the case of reduced electric fields below 150 Td, we found that the ratio of the second positive system of N2 to first positive system of N2 can also be used to reasonably estimate the value of the field. Finally, we show that the reported optical signals from elves can be treated following an inversion method in order to estimate some of the characteristics of the parent lightning.