10.1594/PANGAEA.936887Hejda, PavelPavelHejda0000-0002-3576-5754Revallo, MilošMilošRevalloValach, FridrichFridrichValach0000-0003-0547-0055PANGAEA2021DATE/TIMEMagnetic field variation, declinationMagnetic field variation, H-componentGeomagnetic observatoryDigitising and processing of historical records1842-01-18T05:20:12/1842-01-18T21:20:12Dataset10.1594/PANGAEA.93692110.1002/gdj3.14110.5194/angeo-39-439-202167 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalData 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.Baselines: Declination = -15.416 [deg]; H-component = 18600 [nT]14.41650.086