从土卫六的SLI图象探测可能的地面雾
Possible ground fog detection from SLI imagery of Titan
摘要：
土卫六有着厚厚的、以氮为主的大气层，从卫星和地面观测中可以看到它含有甲烷云。为了研究土卫六表面是否也可以看到云等大气特征，对惠更斯探测器着陆后用侧视成像仪（SLI）拍摄的数据进行了分析，以确定任何潜在的大气特征。总共对82张SLI图像进行了校准、处理和特征检查。校准后的图像显示出平滑的垂直辐射梯度，没有其他可辨别的特征。在平均帧减法之后，六个图像包含扩展的水平特征，当与图像中较高和较低的区域相比时，其具有位于预测辐射的95%置信限之外的辐射值。发现这些特征的光学深度的变化在0.005和0.014之间。据认为，这些功能最有可能起源于一个雾银行的存在接近地平线的上升和下降期间的观察。
英文摘要：
Titan, with its thick, nitrogen-dominated atmosphere, has been seen from satellite and terrestrial observations to harbour methane clouds. To investigate whether atmospheric features such as clouds could also be visible from the surface of Titan, data taken with the Side Looking Imager (SLI) on-board the Huygens probe after landing have been analysed to identify any potential atmospheric features. In total, 82 SLI images were calibrated, processed and examined for features. The calibrated images show a smooth vertical radiance gradient across the images, with no other discernible features. After mean-frame subtraction, six images contained an extended, horizontal feature that had a radiance value that lay outside the 95% confidence limit of the predicted radiance when compared to regions higher and lower in the images. The change in optical depth of these features were found to be between 0.005 and 0.014. It is considered that these features most likely originate from the presence of a fog bank close to the horizon that rises and falls during the period of observation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
