Response of the Cutoff Rigidity of Cosmic Rays to Changes in the Dynamic and Magnetic Parameters of the Solar Wind and Geomagnetic Activity During the Storm on March 23-24, 2023

We investigated the correlations between the cutoff rigidity of cosmic rays and the parameters of interplanetary space, solar wind, and geomagnetic activity during a strong magnetic storm on March 23-24, 2023. The cutoff rigidity of cosmic rays was obtained by calculating the trajectories of particles in the magnetic field of the solar wind according to the Tsyganenko Ts01 model. The analysis showed that the changes in the cutoff rigidity is controlled mainly by changes in the indices of geomagnetic activity Dst (correlation coefficient k ≈ 0.95), as well as electromagnetic parameters - the total value of the interplanetary magnetic field B, its component Bz, the azimuthal component of the electric field Ey, and the plasma parameter β (|k| ≈ 0.6-0.75). The parameters of the solar wind such as velocity V, density N, and dynamic pressure P have little effect on the variations of the cosmic ray cutoff rigidity (|k| < 0.45).