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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Optical flow analysis of the aurora borealis
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Optical flow analysis of the aurora borealis

机译：北极光的光流分析

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Optical observations of the aurora have traditionally focused on the structure, intensity, and wavelength of the emissions. But the apparent motion of auroral forms offers another important diagnostic tool for investigating this poorly understood phenomenon. Prior analyses of auroral motion have focused on tracing individual features. In this letter, we investigate the feasibility of deriving the entire two-dimensional velocity field automatically using robust optical flow estimation. The analysis is applied to two narrow-field video sequences. Both examples are rich in small-scale structure and motion, but appear very different to the eye. The robust optical flow estimator performed well for regions of dense turbulent motion, while sheared flow and flow which is perpendicular to image intensity gradients, was poorly resolved. The relative magnitude of the outliers provides a quantitative measure of the validity of the underlying flow model and, hence, a means of automatically differentiating among auroral forms with differing physical origins. The technique can be used to deduce ionospheric electric fields and neutral winds, and the flow fields yield important physical information about the generation mechanism.
机译：极光的光学观测传统上集中在发射的结构，强度和波长上。但是，极光形式的明显运动提供了另一个重要的诊断工具，可以用来调查这种鲜为人知的现象。先前对极光运动的分析集中于追踪单个特征。在这封信中，我们研究了使用稳健的光流估计自动导出整个二维速度场的可行性。该分析被应用于两个窄场视频序列。这两个示例都具有丰富的小规模结构和运动，但看起来却大不相同。鲁棒的光流估计器在湍流密集的区域表现良好，而剪切流和垂直于图像强度梯度的流却很难解决。离群值的相对大小提供了对潜在流模型有效性的定量度量，因此，提供了一种自动区分具有不同物理起源的极光形式的方法。该技术可用于推导电离层电场和中性风，流场产生有关发电机理的重要物理信息。

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