Magnetic storm observations from the Prague-Clementinum observatory on 1840-11-21@en

Data of magnetic storms recorded at the Prague-Clementinum observatory in 1839-1849 are presented. The data were obtained by digitising and processing the original old records published in the yearbooks of this historical observatory. The data set contains variation of declination [min] and horizontal magnetic field [nT] of 73 magnetic storms with the magnitudes being of at least a moderate level completed with the baseline of declination [deg] and baseline of horizontal megnetic field [nT]. All time data were transformed into UT, based on the longitude of the Göttingen observatory, which was 9.950°. The time shift is thus 39'48''. The date in the file name indicates the start day of the storm.本数据集收录了1839年至1849年间于布拉格克莱门汀天文台（Prague-Clementinum observatory）记录的地磁暴数据。该数据集通过对该历史天文台年鉴中刊载的原始老旧观测记录进行数字化处理后得到。数据集包含73次强度至少为中等水平的地磁暴的磁偏角变化量（单位：分，min）与水平磁场变化量（单位：纳特斯拉，nT），并附带磁偏角基准值（单位：度，deg）与水平磁场基准值（单位：纳特斯拉，nT）。所有时间数据均依据哥廷根天文台（Göttingen observatory）的经度（9.950°）转换为世界时（UT），对应的时间偏移量为39分48秒。文件名中的日期即对应地磁暴的起始日期。