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The purpose of this mission was to investigate the particle acceleration regions above the auroral region in order to develop a better understanding of the acceleration mechanism and of its relation to substorm phenomena. The spacecraft was spin-stabilized with a rotation rate of 7.5 rpm. The attitude was magnetically controlled with spacecraft axis pointing to the sun. All onboard operations such as command and data acquisition were controlled by an onboard computer permitting automatic operations for a full week. The satellite control and main telemetry station is at Kagoshima. Additional telemetry reception is planned at Syowa (Antarctica) and Prince Albert (Canada).

Alternate Names

  • EXOS-D
  • 19822

Facts in Brief

Launch Date: 1989-02-21
Launch Vehicle: M-3SII-1
Launch Site: Uchinoura Space Center, Japan
Mass: 294 kg

Funding Agency

  • Institute of Space and Aeronautical Science, U of Tokyo (Japan)


  • Space Physics

Additional Information

Questions and comments about this spacecraft can be directed to: Dr. James L. Green



NameRoleOriginal AffiliationE-mail
Prof. Hiroshi OyaProject ScientistUniversity of
Prof. Tatsuzo ObayashiProject ManagerInstitute of Space and Aeronautical Science
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