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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Short summary
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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