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This spacecraft was designed to make barium and lithium ion releases in the night magnetosphere at 9.5 and 7 re, respectively, and over North and South America. The main spacecraft was to carry 12 ejectable ion release containers. Diagnostic measurements were to be made on the main spacecraft and on four ejectable sub-payloads. These sub-payloads total approximately 200 kg. Optical measurements were to be made from the ground and from aircraft. The scientific objectives were: (1) study of the plasma processes controlling the formation and decay of a magnetic cavity; (2) study of the momentum exchange with the ambient dilute plasma and of the long-range magnetoshperic perturbations generated thereby; (3) modification of the interaction of trapped energetic particles with self-generated whistler mode and ion cyclotron waves; and (4) tracing of acceleration and redistribution of the injected ions in the inner magnetosphere. The spacecraft would have been battery powered, with a lifetime of less than 48 hours.

Alternate Names

    Facts in Brief

    Launch Date: 1980-05-23
    Launch Vehicle: Ariane
    Launch Site: Kourou, French Guiana
    Mass: 1080 kg

    Funding Agency

    • European Space Agency (International)


    • Space Physics

    Additional Information

    Questions and comments about this spacecraft can be directed to: Dr. H. Kent Hills



    NameRoleOriginal AffiliationE-mail
    Dr. Gerhard HaerendelProject ScientistMax-Planck-Institut fur Extraterrestrische
    Dr. Bernd HauslerProject ManagerMax-Planck-Institut fur Extraterrestrische
    Dr. Mario H. AcunaProject ScientistNASA Goddard Space Flight Center
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