Articles | Volume 43, issue 2
https://doi.org/10.5194/angeo-43-687-2025
https://doi.org/10.5194/angeo-43-687-2025
Regular paper
 | 
05 Nov 2025
Regular paper |  | 05 Nov 2025

A comparison of methods to compute the rate of horizontal geomagnetic field variation

Samuel A. Fielding, Philip W. Livermore, Ciarán D. Beggan, Kathryn A. Whaler, and Gemma S. Richardson

Related authors

Long term monitoring of the geoelectric field in the UK – 2012–2024
Robert Lyon, Gemma S. Richardson, and Orsi Baillie
EGUsphere, https://doi.org/10.5194/egusphere-2025-2463,https://doi.org/10.5194/egusphere-2025-2463, 2025
Short summary
Production of definitive data from Indonesian geomagnetic observatories
Relly Margiono, Christopher W. Turbitt, Ciarán D. Beggan, and Kathryn A. Whaler
Geosci. Instrum. Method. Data Syst., 10, 169–182, https://doi.org/10.5194/gi-10-169-2021,https://doi.org/10.5194/gi-10-169-2021, 2021
Short summary

Cited articles

Abda, Z. M. K., Aziz, N. F. A., Kadir, M. Z. A. A., and Rhazali, Z. A.: A Review of Geomagnetically Induced Current Effects on Electrical Power System: Principles and Theory, IEEE Access, 8, 200237–200258, https://doi.org/10.1109/ACCESS.2020.3034347, 2020. a
Akasofu, S. I.: The development of the auroral substorm, Planetary and Space Science, 12, 273–282, https://doi.org/10.1016/0032-0633(64)90151-5, 1964. a
Alken, P. and Egbert, G. D.: Modeling Toroidal Currents in the Ionospheric Electrojet Regions, Journal of Geophysical Research: Space Physics, 130, e2024JA033080, https://doi.org/10.1029/2024JA033080, 2025. a
Bedrosian, P. A.: MT+, Integrating Magnetotellurics to Determine Earth Structure, Physical State, and Processes, Surveys in Geophysics, 28, 121–167, https://doi.org/10.1007/s10712-007-9019-6, 2007. a
Bennett, J. S., Vyhnalek, B. E., Greenall, H., Bridge, E. M., Gotardo, F., Forstner, S., Harris, G. I., Miranda, F. A., and Bowen, W. P.: Precision Magnetometers for Aerospace Applications: A Review, Sensors, 21, 5568, https://doi.org/10.3390/s21165568, 2021. a
Download
Short summary
Space weather can cause electric currents to flow through the ground at the Earth’s surface. These currents correspond closely to the rate of change of the magnetic field, following Faraday’s law of induction. The scientific community regularly uses two different methods to calculate the rate of change of the magnetic field for this purpose. We show that there is a large difference between the two methods, and highlight certain situations where this difference is potentially significant.
Share