Solar cosmic ray protons in periods of inversion of the Solar polar magnetic field

The behavior of energetic solar cosmic ray (SCR) protons recorded on the Earth's orbit before, during, and after inversion of the solar polar magnetic field in the 21st, 22nd, and 22rd eleven-year cycles of solar activity is analyzed. During all three cycles, prolonged (for about a year) reductions in fluences by a factor of almost ten have been detected, and they coincide in time with the inversion period. Accompanying these reductions is a substantial softening of the energy spectrum of SCR protons, which may serve as an additional indication of the inversion of the solar polar magnetic field.