The energy spectrum of solar cosmic rays during periods of their ground level enhancements

Abstract

By data of the neutron monitor worldwide station network the events of ground level enhancements of solar cosmic rays are studied. The absolute flow J and the energy spectral index γ of solar cosmic rays during the isotropic phase for 14 GLE events observed for 1977-2006 have been estimated using the method of effective energy by [1]. It is shown that in these events the changes of the power spectral index in the range from 3 to 7 are observed. It is noted that for the individual events the index about 5 is observed for a long time.