Dynamics of relativistic SCRs and registration of multiple neutrons during the event of December 13, 2006

The dynamics of relativistic SCRs during the event of December 13, 2006, the characteristics of which were obtained from the neutron monitor data by solving the inverse problem, has been studied. A strongly collimated flux of relativistic protons, which caused an impulse-like increase at several European stations, was registered during the event initial phase. The delayed component had a softer spectrum and a large isotropic component. The Barentsburg neutron monitor registered a significant increase in neutrons with multiplicities of 2–4 during the event of December 13, 2006.