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Spatial correlation of OH Meinel and O2 Infrared Atmospheric nightglow emissions observed with VIRTIS-M on board Venus Express

机译:在Venus Express上使用VIRTIS-M观察到的OH Meinel和O2红外大气夜光排放的空间相关性

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摘要

We present the two-dimensional distribution of the O2 a1∆-X3Σ (0-0) band at 1.27 µm and the OH ∆v=1 Meinel airglow measured simultaneously with the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on board Venus Express. We show that the two emissions present very similar spatial structures. A cross-correlation analysis indicates that the highest level of correlation is reached with only very small relative shifts of the pairs of images. In spite of the strong spatial correlation between the morphology of the bright spots in the two emissions, we also show that their relative intensity is not constant, in agreement with earlier statistical studies of their limb profiles. We conclude that the two emissions have a common precursor that controls the production of both excited species. We argue that atomic oxygen, which produces O2(1∆) molecules by three-body recombination and is the precursor of ozone formation, also governs to a large extent the OH airglow morphology through the H + O3 → OH* + O2 reaction.
机译:我们展示了在Venus Express上同时测量的O2 a1∆-X3Σ(0-0)波段在1.27 µm处的二维分布和OH ∆v = 1 Meinel气辉,同时通过可见和红外热成像光谱仪(VIRTIS)进行了测量。我们表明两种排放物呈现出非常相似的空间结构。互相关分析表明,仅通过成对的图像的相对很小的偏移就可以达到最高的相关级别。尽管两次排放中亮点的形态之间存在很强的空间相关性,但我们也表明,它们的相对强度不是恒定的,这与早期对其肢体轮廓的统计研究一致。我们得出的结论是,这两种排放物具有共同的前体,可控制两种激发物质的产生。我们认为,原子氧通过三体重组产生O2(1∆)分子,并且是臭氧形成的前体,它在很大程度上还通过H + O3→OH * + O2反应支配OH气辉形态。

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