EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Periodicities in fair weather potential gradient at ground level from different latitudes 

José Tacza1,2, Keri Nicoll3, and Edith Macotela4,5
José Tacza et al.
  • 1Institute of Geophysics Polish Academic of Sciences, Warsaw, Poland (
  • 2Center of Radio Astronomy and Astrophysics Mackenzie, Engineering School, Mackenzie Presbyterian University, Sao Paulo, Brazil
  • 3Department of Meteorology, University of Reading, UK (
  • 4Faculty of Mathematics and Natural Sciences, University of Rostock, Rostock, Germany (
  • 5Leibniz-Institute of Atmospheric Physics e.V. at University of Rostock, Kuhlungsborn, Germany

Analysis of the variation of the potential gradient (PG) at ground level is important to monitor the global electric circuit and the different solar and geophysical phenomena affecting it. However, this is challenging since several factors (e.g., meteorological) produce perturbations in the potential gradient. For this reason, timeseries and spectral analysis of PG at several stations are required. In this work, for the first time we performe the spectral analysis of the potential gradient recorded at several sites located at Vostok, Concordia, Halley and Casleo (South Hemisphere), and Sodankyla and Reading (North Hemisphere). In order to find the main periodicities and how the amplitude of those periods change as a function of time we use the Lomb-Scargle Periodogram and the Wavelet Transform, respectively. For all PG sites the periodicities of 0.5, 1, ~180 and 365-day were found. It was also found evidence of the ~27- and ~45-day periods. Further analysis using the cross-wavelet transform for PG versus cosmic rays, PG versus Madden-Julian Oscillation index, and PG versus meteorological parameters, shows that the 27- and 45-day periods are likely related to the solar rotation and Madden- Julian Oscillation, respectively. Moreover, for the 27-day period we found that the relationship is stronger during the occurrences of co-rotating interaction regions.

How to cite: Tacza, J., Nicoll, K., and Macotela, E.: Periodicities in fair weather potential gradient at ground level from different latitudes , EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-97,, 2022.

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