Variations in the cosmic-ray rigidity spectrum during events of January 2005

Variations in the cosmic-ray (CR) rigidity spectrum during events of January 2005 have been investigated on the basis of the ground-based observations of the CR intensity performed at the world network of stations using spectrographic global survey. The parameters of the CR rigidity spectrum reflecting the electromagnetic characteristics of heliospheric fields during the events under study have been determined in the combined analysis of ground-based and satellite measurements of protons with energies from several megaelectronvolts to several tens of gigoelectronvolts. The CR variations in a wide energy range are explained on the basis of the analysis performed.