ИСТИНА

An unusual infrasonic event with a 30-minute duration was detected by Polar Geophysical Institute (PGI) (Apatity; 67.3N, 33.3E) infrasonic array on September 24, 2002 at 22:20 UT. Sensors aboard US Department of Defense (DOD) satellites detected the impact of a bolide on 24 September 2002 at 16:49 UT. The bolide appeared to explode at an altitude of 30 km above the Vitim river, Siberia (58.21N, 113.46E). The total radiated energy was 8.6x10^11 Joules. The infrasonic signal was detected by three spatially separated microbarographs operating in the passband from 0.0001 to 1 Hertz at a distance of 4000 km from the source. Estimates were made of both the local infrasound velocity and the direction of the signal arrival. These values are in agreement with the acoustic travel velocity and the source azimuth. The shape and duration of the signal detected permit us to consider it as a solitary wave generating by the Bolide explosion and propagating through the atmospheric acoustic wave guide.