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Measuring and modeling twilight's Belt of Venus

机译:测量和建模暮光之城的金星腰带

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The Belt of Venus (or antitwilight arch) is a reddish band often seen above the antisolar horizon during clear civil twilights, and immediately beneath it is the bluish-gray earth's shadow (or dark segment) cast on the atmosphere. Although both skylight phenomena have prompted decades of scientific research, surprisingly few measurements exist of their spectral, colorimetric, and photometric structure. Hyperspectral imaging of several clear twilights supplies these missing radiometric details and reveals some common spectral features of the antisolar sky at twilight: (1) color differences between the dark segment and the sunlit sky above the antitwilight arch are small or nil; (2) antisolar color and luminance extremes usually occur at different elevation angles; and (3) the two twilight phenomena are most vivid for modest aerosol optical depths. A second-order scattering model that includes extinction by aerosols and ozone provides some preliminary radiative transfer explanations of these twilight features' color and brightness. (C) 2015 Optical Society of America
机译:金星带(或暮光拱门)是一个带红色的带,通常在晴朗的民用暮光之夜在反太阳地平线上方可见,而在其下方的是一片蓝色灰色的地球阴影(或暗段),投射在大气上。尽管两种天窗现象都促使了数十年的科学研究,但令人惊讶的是,几乎没有测量到它们的光谱,比色和光度结构。几个清晰的暮光的高光谱成像提供了这些缺失的辐射细节,并揭示了暮光时反日天空的一些常见光谱特征:(1)反暮光拱上方的暗段和阳光充足的天空之间的色差很小或为零; (2)反日光的颜色和亮度极限通常发生在不同的仰角; (3)在适度的气溶胶光学深度下,这两种暮光现象最为生动。包含气溶胶和臭氧消光的二阶散射模型为这些暮色特征的颜色和亮度提供了一些初步的辐射传递解释。 (C)2015年美国眼镜学会

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