Cosmos 381 () satellite provided data on the physical characteristics of the layers of the Earth's Ionosphere using a Mayak radio transmitter. The study covered almost the entire global surface. Launch It was launched to a Low Earth Orbit by a Kosmos-3 rocket (11K65M) from the LC–132/2 starting point at Plesetsk Cosmodrome on 2 December 1970. Orbit Orbit was 971 x 1013km. Inclination 74 degrees. Decay into the Earth's atmosphere is expected after about 1,200 years. See also 1970 in spaceflight External links Űrhajózási lexikon. Chief editor Iván Almár. Budapest: Akadémiai – Zrínyi. 1981. Lib.Cas Nasa-Gsfc Astronautix References Spacecraft launched in 1970 1970 in spaceflight 1970 in the Soviet Union Kosmos satellites