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We present a simulation of magnetosphere transparency for cosmic rays in the last two millennia. Simulations were done in the COR system, in a module for cosmic rays trajectory evaluation in different models of geomagnetic fields for the period 0 to 1900 CE. The COR system available at cor.crmodels.org is also briefly presented. The global and local trends for cut-off rigidities and cosmic rays intensity evolution in the last two millennia are analyzed.

The geographical distribution of cosmic ray intensity at the Earth's surface significantly changes, mostly with geomagnetic latitude. Moreover, the transparency of the magnetosphere changes temporally, with significant changes during geomagnetic storms. In this article, we address the question: Where on the Earth's surface are the biggest relative and absolute changes in cosmic ray intensity during geomagnetic storms? We simulate a global situation for a set of selected geomagnetic storms and discuss obtained results.

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We present error estimation for the COR system dedicated to the cosmic rays trajectories in magnetosphere tracing available at https://cor.crmodels.org and on GitHub https: //github.com/COR-Cut-off-rigidity/Trajectories_IGRF_T04_C. The used numerical method is analyzed and model dependence on crucial parameters is shown. The base error criterium to evaluate/determine model precision is defined. *** 27th European Cosmic Ray Symposium -ECRS *** *** 25-29 July 2022 *** *** Nijmegen, the Netherlands *** * Speaker