227 



^ U.S.S.R. 



IK-12 : October 31, 1974, continued studies of the 



atmosphere and ionosphere and flow of micro- 

 meteorites. It carried equipment from Hungary, 

 Czechoslovakia, the Democratic Republic of 

 Romania, and the U.S.S.R. 



IK-13 : March 27, 1975, studied dynamic processes In the 



magnetosphere and polar ionosphere. It carried 

 equipment from Czechoslovakia and the U.S.S.R. 



IK-IA : December 11, 1975, studied low-frequency eletro- 



magnetic fluctuations in the magnetosphere to 

 measure micrometeoritic Intensity. It carried 

 equipment from Bulgaria, Hungary, Czechoslovakia, 

 and the U.S.S.R. 



IK-15 : June 19, 1976, introduced a new payload called 



automatic universal orbital station (AUOS) 

 which carried a greater volume and weight of 

 scientific equipment than previous payloads, 

 and could be controlled at any point in its 

 orbit, not just over ground command stations. 

 A new unified telemetrlc system (YeTMS) for 

 digital transmission also was Included. Parti- 

 cipants in the telemetrlc system Included Hungary, 

 Poland, the Democratic Republic of Germany, 

 Czechoslovakia, and the U.S.S.R. 



IK-16 : July 27, 1976, continued studies of ultraviolet 



and x-ray radiation from the Sun and the effect 

 of radiation on the Earth's upper atmosphere 

 equipment came from Czechoslovakia, the Democratic 

 Republic of Germany, the U.S.S.R. and Sweden. 

 Simultaneous observations of the Sun were made 

 by Bulgaria, Hungary, the Democratic of Republic 

 of Germany, Czechoslovakia, and the U.S.S.R. 



IK-17 : September 24, 1977, continued previous experi- 



ments on the relationship between solar activity 

 and the Earth's upper atmosphere. It carried 

 equipment from Hungary, Romania, Czechoslovakia, 

 Bulgaria and the U.S.S.R. 



IK-18/MAGI0N : October 24, 1978, conducted studies of electro- 

 magnetic relationships between the Earth's 

 magnetosphere and ionosphere and of low-frequency 

 radio waves in the circumterrestial plasma. 

 The MAGION satellite separated from IK-18 and 

 went in a trajectory very close to the parent 

 satellite and conducted similar studies of 



