Preprints
https://doi.org/10.5194/angeo-2021-11
https://doi.org/10.5194/angeo-2021-11

  19 Feb 2021

19 Feb 2021

Review status: this preprint is currently under review for the journal ANGEO.

The geomagnetic data of the Clementinum observatory in Prague since 1839

Pavel Hejda1, Fridrich Valach2, and Miloš Revallo3 Pavel Hejda et al.
  • 1Institute of Geophysics, Academy of Sciences of the Czech Republic, Boční II/1401, 141 00 Prague, Czech Republic
  • 2Geomagnetic Observatory, Earth Science Institute, Slovak Academy of Sciences, Komárňanská 108, 947 01 Hurbanovo, Slovakia
  • 3Earth Science Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia

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.

Pavel Hejda et al.

Status: open (until 02 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • AC1: 'Comment on angeo-2021-11', Pavel Hejda, 25 Feb 2021 reply
    • EC1: 'Reply on AC1', Nick Sergis, 25 Feb 2021 reply
  • RC1: 'Comment on angeo-2021-11', Anonymous Referee #1, 27 Feb 2021 reply

Pavel Hejda et al.

Pavel Hejda et al.

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