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 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 evolution in the last two millennia are analyzed. Consequences for radiocarbon dating are discussed.
cosmic rays; Earth's magnetic field; radiocarbon dating