Fig. 3.
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Geographical distribution of the geomagnetic vertical cutoff rigidity for 23 February 1956, prior to the event onset, calculated by the OTSO model (Larsen et al. 2023) using the combination of the IGRF (Alken et al. 2021) and TS89 (Tsyganenko 1989) models for the internal and external part of the magnetosphere, respectively. The locations of the NMs from Table 1 are shown as dots.
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