Effects in cosmic rays in March 1991

Using the method of spectrographs global survey, variations in rigidity spectrum and anisotropy of galactic cosmic rays (March 1991) have been studied using data from ground-based observations of cosmic rays (CR) at the worldwide network of stations. Variations in geomagnetic cutoff rigidity (GCR) have been calculated. The paper also presents latitudinal GCR variations at certain moments of the period under consideration, for different levels of the geomagnetic field disturbance. Calculation results of GCR variations have been compared with calculations of effect of the westward current flowing with the strength proportional to the latitude cosine along parallels on the sphere, for different radii of the current ring in the dipole field. These results can be used to test different models of magnetospheric current systems and their dynamics during geomagnetic disturbances.