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The pioneering storm-time model of magnetospheric magnetic field T01S madepossible trajectory calculations for the events of giant magnetic storms. Wehave performed such calculations for a unique magnetic storm on 20 November2003. In our previous paper, Belov et al. (2005), dedicated to themagnetospheric effects of cosmic rays (CR) during this storm, we revealed ananomalous behavior of a cutoff rigidity variation at the Mexico station. Here,by trajectory calculations, we demonstrate that this peculiarity persists inthe latitudinal and longitudinal curves of cutoff rigidity (Rc) for bothquiet and storm-time conditions and thus should be considered as physicallymeaningful

Anomalous behavior of cutoff rigidity variation in the region of the Mexico station during a magnetic superstorm on 20 November 2003