*Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119899 Moscow, Russia
**Institute of Biomedical Problems, 123007 Moscow, Russia
Abstract:
Dose variations, associated with the 11-year solar activity cycle, seasonal variations of particle fluxes in the Earth's radiation belts at the station orbit, and solar proton events are studied, using prolonged measurements of radiation doses inside orbital station Mir. Daily averages of radiation doses during the declining phase of the 22nd solar cycle and during transition to the 23rd solar activity cycle reached very large values for astronauts and significantly exceed the values calculated according to existing models.