Time series of the longitudinal gradient of Venus's brightness temperature measured by Akatsuki LIR

The files contain the time series of the longitudinal gradient of Venusian cloud's brightness temperature measured by LIR onboard JAXA's Venus orbiter Akatsuki. The data were derived and analyzed in the paper "Planetary-Scale Waves Seen in Thermal Infrared Images of Venusian Cloud Top" by Kajiwara et al. The filename represents the latitude for each time series (For example, "10N" means 10 degrees north, and "EQ" means the equator). In all files, the first column gives the approximate elapsed time in days from 18 May 2017: the exact dates are given in the paper. The second column gives the longitudinal gradient of the brightness temperature in unit of K/degree.本数据集包含由日本宇宙航空研究开发机构（JAXA）金星探测器"拂晓"号（Akatsuki）搭载的长波红外相机（Longwave Infrared Camera, LIR）所测得的金星云层亮温经度梯度时间序列数据。该数据源自Kajiwara等人发表的论文《金星云顶热红外影像中的行星尺度波动》（Planetary-Scale Waves Seen in Thermal Infrared Images of Venusian Cloud Top），并经过相关分析处理。文件名对应各时间序列的采集纬度：例如"10N"代表北纬10度，"EQ"代表赤道。所有文件的第一列为自2017年5月18日起计算的近似累计天数，精确日期详见论文；第二列为亮温经度梯度，单位为开尔文每度（K/°）。