The evaluation of crustal field influence to geomagnetic cutt-off rigidities

The cut-off rigidities of cosmic rays usually do not reflect the influence of the crustal geomagnetic field. Due to the weakness of the crustal field effect to the cosmic rays trajectories are very minor. However, two regions of the world have a crustal field with significantly higher values. The effect of the crustal field in those regions is evaluated. The consequences for the approach of cosmic rays to Earth's surface (top of the Earth atmosphere) in the last decades are analyzed and discussed. Presented are suggestions for possible modification of models for evaluation of Earth's magnetosphere transparency for cosmic rays.