Ionospheric, magnetospheric studies. The Czechoslovak satellite MAGION was launched into orbit by the Soviet spacecraft Intercosmos 18. It forms a part of the scientific programme of Intercosmos 18, launched from USSR territory on 24 Oct 1978. MAGION was separated into an autonomous orbit on 14 Nov 1978. General function: Reasearch of the magnetosphere and ionosphere of the earth (magnetosphere-ionosphere satellite).

Deployed from Intercosmos 24 10/3/89; examined signal propogation from Intercosmos 24. Research of the magnetosphere and the ionosphere of the Earth. The Czechoslovak satellite Magion 2 was launched into orbit by the Soviet spacecraft Intercosmos 24. Magion 2 forms a part of the scientific programme of Intercosmos 24 (project Aktivnyj) Exe cution of the scientific programme of the 'Aktivny' project in conjunction with Intercosmos-24, permitting simultaneous spatially separating investigations of plasma processes in circumterrestrial space.

Separated from Intercosmos 25 on 12/28/91; geophysical. Research of magnetosphere nad the ionosphere of the Earth by passive and active methods. Launched on 18 Dec 1991. The Czechoslovak satellite Magion 3 forms, together with the spacecraft Intercosmos 25, part of the Apex scientific project. Magion 3 was sep arated into an autonomous orbit on 28 Dec 1991. Magion 3 was launched into orbit by the Soviet spacecraft Intercosmos 25.