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SWIR Air Glow Mapping of the Night Sky

机译:夜空的SWIR气辉映射

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It is well known that luminance from photo-chemical reactions of hydroxyl ions in the upper atmosphere (~85 km altitude) produces a significant amount of night time radiation in the short wave infra-red (SWIR) band of wave length 0.9 to 1.7 urn. Numerous studies of these phenomena have demonstrated that the irradiance shows significant temporal and spatial variations in the night sky. Changes in weather patterns, seasons, sun angle, moonlight, etc have the propensity to alter the SWIR air glow irradiance pattern. By performing multiple SWIR measurements a mosaic representation of the celestial hemisphere was constructed and used to investigate these variations over time and space. The experimental setup consisted of two sensors, an InGaAs SWIR detector and a visible astronomical camera, co-located and bore sighted on an AZ-EL gimbal. This gimbal was programmed to view most of the sky using forty five discrete azimuth and elevation locations. The dwell time at each location was 30 seconds with a total cycle time of less than 30 minutes. The visible astronomical camera collected image data simultaneous with the SWIR camera in order to distinguish SWIR patterns from clouds. Data was reduced through batch processing producing polar representations of the sky irradiance as a function of azimuth, elevation, and time. These spatio-temporal variations in the irradiance, both short and long term, can be used to validate and calibrate physical models of atmospheric chemistry and turbulence. In this paper we describe our experimental setup and present some results of our measurements made over several months in a rural marine environment on the Islands of Kauai and Maui Hawaii.
机译:众所周知,高层大气(〜85 km高度)中氢氧根离子的光化学反应产生的亮度会在波长为0.9至1.7 um的短波红外(SWIR)波段中产生大量的夜间辐射。对这些现象的大量研究表明,辐照度在夜空中显示出明显的时空变化。天气模式,季节,太阳角度,月光等的变化都有改变SWIR空气辉度辐照度的趋势。通过执行多个SWIR测量,可以构建天体半球的镶嵌图,并用于研究这些随时间和空间的变化。实验装置由两个传感器组成,一个是InGaAs SWIR检测器,另一个是可见的天文相机,位于AZ-EL万向架上,并在同一位置并可以看到孔。该云台经过编程,可使用45个离散的方位角和仰角位置查看大部分天空。每个位置的停留时间为30秒,总循环时间少于30分钟。可见的天文相机与SWIR相机同时收集图像数据,以便将SWIR模式与云区分开。通过批处理来减少数据,从而产生与方位角,高程和时间有关的天空辐照度的极坐标表示。这些短期和长期辐照度的时空变化可用于验证和校准大气化学和湍流的物理模型。在本文中,我们描述了我们的实验装置,并介绍了在考艾岛和夏威夷毛伊岛的一个乡村海洋环境中进行几个月的测量得出的一些结果。

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