Abstract. The historical magnetic observatory Clementinum operated in Prague from 1839 to 1926. The data from the yearbooks that recorded the observations at Clementinum have recently been digitized and were subsequently converted in this work into the physical units of the International System of Units (SI). Introducing a database of geomagnetic data from this historical source is a part of our paper. Some controversial data are also analysed here. In the original historical sources, we identified an error in using the physical units. It was probably introduced by the then observers with the determination of the temperature coefficient of the bifilar apparatus. By recalculating the values ​​in the records, some missing values ​​are added; for instance, the temperature coefficients for the bifilar magnetometer, the baselines, and the annual averages for the horizontal intensity in the first years of observations were re-determined. The values ​​of absolute measurements of the declination in 1852, which could not be found in the original sources, were also estimated. The main contribution of this article rests in critically reviewed information about the magnetic observations in Prague, which is as complete as no other so far. The work also contributes to the space weather topic by revealing a record of the now almost forgotten magnetic disturbance of 3 September 1839.

中文翻译：

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自1839年以来在布拉格的Clementinum天文台的地磁数据

摘要。历史悠久的磁观测天文台Clementinum于1839年至1926年在布拉格运作。记录了Clementinum观测值的年鉴中的数据最近已被数字化，随后在这项工作中被转换为国际单位制（SI）的物理单位。引入来自这一历史来源的地磁数据数据库是我们论文的一部分。这里还分析了一些有争议的数据。在原始历史资料中，我们发现使用物理单位时出现错误。它可能是由当时的观察者介绍的，用于确定双线装置的温度系数。通过重新计算记录中的值，添加了一些缺失的值; 例如双线磁力计的温度系数，基线，重新确定了观测第一年的水平强度的年平均值。还估算了1852年赤纬的绝对测量值，这在原始资料中找不到。本文的主要贡献在于，对布拉格的磁观测资料进行了严格的审查，到目前为止，该资料还没有其他资料完整。这项工作还揭示了1839年9月3日现在几乎被人们遗忘的磁干扰的记录，从而对空间天气话题做出了贡献。本文的主要贡献在于，对布拉格的磁观测资料进行了严格的审查，到目前为止，该资料还没有其他资料完整。这项工作还揭示了1839年9月3日现在几乎被遗忘的磁干扰的记录，从而对空间天气话题做出了贡献。本文的主要贡献在于，对布拉格的磁观测资料进行了严格的审查，到目前为止，该资料还没有其他资料完整。这项工作还揭示了1839年9月3日现在几乎被人们遗忘的磁干扰的记录，从而对空间天气话题做出了贡献。