Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 44, issue 2
Articles | Volume 44, issue 2
https://doi.org/10.5194/angeo-44-1303-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-44-1303-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 44, issue 2
Regular paper
 | 
10 Nov 2026
Regular paper |  | 10 Nov 2026

Reevaluation of EISCAT plasma parameters during the May 2024 geomagnetic storm using O+ ratios from AMIE-driven SD-WACCM-X

Florian Günzkofer, Anders Tjulin, Gang Lu, Hanli Liu, and Gunter Stober

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Short summary
Incoherent scatter radars (ISRs) are an important measurement tool for space weather research. However, ISR measurements require previous knowledge of the state of the ionosphere, especially the ratio of atomic oxygen ions (O+) to electrons. We present ISR measurements during the May 2024 "Mothers' Day Storm" and apply data assimilation-based O+ ratios, which should result in more accurate ISR measurements. The advantages and disadvantages of our method are compared to those of other approaches.
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