ABSTRACT

Airglow emissions which originate from the mesospheric and thermospheric altitudes have been routinely being monitored at Kolhapur (16.8° N, 74.2° E), Maharashtra, India, using ground base remote sensing imagers. We note that the observable amplitudes of very small-scale waves during April 2020 were significantly smaller than the regular observations. We investigate the reason for these low observable amplitudes. It is noted that drastic improvement in the quality of images was due to better contrast, which is attributed to significant reduction in greenhouse gases and aerosol loading in the atmosphere by the complete shutdown of local man-made emissions. Results suggest that lockdown had an important repercussion on the visibility through the improved air quality and thus better viewing conditions, which were reflected in the remotely sensed observations made with airglow imager.

摘要

在印度马哈拉施特拉邦的科哈布尔（16.8°N，74.2°E），使用地基遥感成像仪常规监测来自中层和热层高度的气辉发射。我们注意到，2020年4月期间非常小规模的电波的可观测振幅明显小于常规观测。我们调查了这些低可观察幅度的原因。值得注意的是，图像质量的显着提高归因于更好的对比度，这归因于完全关闭了本地人为排放物，从而大大减少了温室气体和大气中的气溶胶含量。结果表明，锁定功能通过改善空气质量和改善观看条件，对能见度产生了重要影响，