Magnetic storm observations from the Prague-Clementinum observatory on 1840-12-19

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年布拉格克莱门特天文台记录的地磁暴观测数据。该数据集通过对该历史天文台年刊中刊载的原始老旧记录进行数字化与处理后获得。数据集包含73次中等及以上强度地磁暴的磁偏角（单位：[min]）与水平磁场（单位：[nT]）变化数据，并附带磁偏角基线（单位：[deg]）与水平磁场基线（单位：[nT]）。所有时间数据均基于哥廷根天文台的经度（9.950°）转换为世界时（UT），对应的时间偏移量为39分48秒。文件名中所标注的日期即为对应地磁暴的起始日期。