NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header




ESRO 1/Boreas was an 80 kg, cylindrically shaped, solar cell powered spacecraft carrying eight scientific experiments chosen to measure a comprehensive range of auroral effects. The measurements included auroral luminosity, ionospheric composition and temperature, and the flux and energy spectra of trapped and precipitated energetic particles (electrons from 1 to 400 KeV, protons from 1 KeV to 30 MeV). The satellite was magnetically stabilized and was launched into a low nearly circular orbit on October 1, 1969, resulting in a rather short lifetime of only 52 days. Even so, during this period, a large amount of onboard tape recorder and real-time data were recovered. These data are particularly valuable in correlative studies with the identical satellite ESRO 1/Aurorae that was launched October 3, 1968, into a similar orbit, and operated until June 26, 1970.

Alternate Names

  • 04114
  • Borealis
  • ESRO 1B

Facts in Brief

Launch Date: 1969-10-01
Launch Vehicle: Scout
Launch Site: Vandenberg AFB, United States
Mass: 80 kg

Funding Agency

  • European Space Agency (International)


  • Space Physics

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Mr. Herbert L. EakerProject ManagerNASA Goddard Space Flight Center
[] NASA Logo -