Preprints
https://doi.org/10.5194/angeo-2023-12
https://doi.org/10.5194/angeo-2023-12
12 Apr 2023
 | 12 Apr 2023
Status: this preprint is currently under review for the journal ANGEO.

The record of the magnetic storm on 15 May 1921 in Stará Ďala (present day Hurbanovo) and its compliance with the global picture of this extreme event

Eduard Koči and Fridrich Valach

Abstract. This paper deals with the most intense magnetic storm of the 20th century, which took place on 13–15 May 1921. Part of this storm was observed in magnetic declination and vertical intensity also at Stará Ďala, currently known as Hurbanovo. However, the sensitivity of the magnetometer was not determined there in the years when the storm occurred. Here, we estimated the sensitivity scale values on the base of data from before and after the studied event. The resulting digitized Stará Ďala’s data for 13–15 May 1921 are the main contribution of this work. The data were also put into the context of the records from other observatories. The overall picture of the geomagnetic field variations compiled from the observations by worldwide observatories, including Stará Ďala, suggests that the auroral oval got close to Stará Ďala and other European mid-latitude observatories in the morning hours on 15 May 1921.

Eduard Koči and Fridrich Valach

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2023-12', Anonymous Referee #1, 15 May 2023
    • AC1: 'Reply on RC1', Fridrich Valach, 30 May 2023
  • RC2: 'Comment on angeo-2023-12', Anonymous Referee #2, 22 May 2023
    • AC2: 'Reply on RC2', Fridrich Valach, 30 May 2023
  • RC3: 'Comment on angeo-2023-12', Hans-Joachim Linthe, 31 May 2023
    • AC3: 'Reply on RC3', Fridrich Valach, 31 May 2023

Eduard Koči and Fridrich Valach

Eduard Koči and Fridrich Valach

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Short summary
We dealt with the most intense magnetic storm of the 20th century, which took place on 13–15 May 1921. It was also observed at Stará Ďala (present-day Hurbanovo). However, the record was not complete. We estimated the missing sensitivity scale values and presented the resulting digitized Stará Ďala’s data for 13–15 May 1921. The data were compared with the records from other observatories. The analysis suggests that the auroral oval got close to Stará Ďala in the morning hours on 15 May 1921.