ИСТИНА

Based on the method of partial reflections (PRM), the behaviour of the polar bottom ionosphere above the settlement Tumanny (Murmansk region) is studied during registration of a powerful gamma-splash from the repeater of soft gamma-rays SGR 1806-20. A huge gamma-flash and its ionospheric effect have been found out on satellites and by ground means of VLF-measurements on December, 27, 2004 approximately at 21:31 UT. At this time the settlement Tumanny was in the shadow of the Earth and the ionosphere above it was well shined with the full Moon. The moon passed through the meridian, on which there was a point of observations, at 21:53 UT. It was shown that there was a big similarity in time variations of amplitudes of partial reflections and reflections of radiowaves at the very low frequencies which were observed in the lighted hemisphere of the Earth. At that time, the amplitude of partially reflected signals from the ionosphere pulses with the period of 7.5 s, which is commensurable with the period of rotation of the neutron star - a source of the gamma-splash.