ИСТИНА

Ground level enhancement (GLE) was detected by the worldwide network of neutron monitors. This is the second GLE event in the 24th solar cycle. The active "Beta-Gamma-Delta" region А2673 produced it. During September 2017 the region produced a series of strong flares (up to X class). The flare which produced the GLE was of X8.2 magnitude with coordinates S08W83 and started at 15:35 UT. GLE amplitude on neutron monitors did not exceed 6\% for 5-min data reduced to the sea level, a lot of stations registered it. Fort Smith (Canada) was the first station detected the solar cosmic rays in 16:10 UT. At the nearest station Inuvik the increase began about half hour later. This is an evidence of a strong anisotropy on the first phase. We have analyzed the GLE event: energy spectra and pitch-angle distribution were derived using a methodics developed by our group. It includes calculation of asymptotic cone for each station using a modern magnetosphere model and solution of the inverse problem. This methodics was already used to calculate many GLE events. Differential energy spectra during the event are derived with a 5-min step. The spectra are not purely power-law forms, but average slope is about $\gamma$ = -4. This is hard (rigid) spectrum of solar cosmic rays. The results were compared with GOES spacecraft measurements on adjacent energy range. There is an acceptable agreement.