Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 43, issue 1
Articles | Volume 43, issue 1
https://doi.org/10.5194/angeo-43-15-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-43-15-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 43, issue 1
Regular paper
 | 
06 Jan 2025
Regular paper |  | 06 Jan 2025

A two-step geospace storm as a new tool of opportunity for experimentally estimating the threshold condition for the formation of a substorm current wedge

Leonid F. Chernogor

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Cited articles

Abe, O. E., Fakomiti, M. O., Igboama, W. N., Akinola, O. O., Ogunmodimu, O., and Migoya-Orué, Y. O.: Statistical analysis of the occurrence rate of geomagnetic storms during solar cycles 20–24, Adv. Space Res., 71, 2240–2251, https://doi.org/10.1016/j.asr.2022.10.033, 2023. 
Al Shidi, Q., Pulkkinen, T., Toth, G., Brenner, A., Zou, S., and Gjerloev, J.: A large simulation set of geomagnetic storms–Can simulations predict ground magnetometer station observations of magnetic field perturbations?, Space Weather, 20, e2022SW003049, https://doi.org/10.1029/2022SW003049, 2022. 
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This study, for the first time, convincingly attests to the two-step geospace storm being the best possible solar–terrestrial event of opportunity for realizing a technique for estimating the interplanetary magnetic field (IMF) Bz component threshold for the formation of the substorm current wedge. The data from INTERMAGNET magnetometer network on the two-step geospace 23–24 April 2023 storm yield the IMF Bz threshold for the formation of the substorm current wedge of –(22–30) nT.
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