Descrizione : Vandenberg post stamp and Esro 1 cooperative program satellite to study polar phenomena, ESRO 1 was built in Europe but launched in the USA under program between the 10 nation European Space Research Organisation ( ESRO) and the US NASA.

ESRO-1/Aurorae was a 80-kg, cylindricallly shaped, solar-cell-powered spacecraft instrumented with seven scientific experiments chosen to measure a comprehensive range of auroral effects. The measurements include auroral luminosity, ionospheric composition and temperature, and the flux, type and energy spectra of trapped and precipitated energetic particles (electrons of energies 1 to 30,000 KeV). The spacecraft was placed in a low polar orbit with its axis of symmetry magnetically aligned along the earth`s field. It had operated satisfactorily for 18 months, except for the tape recorder which failed after 7 months. Aurorae was expected to reenter the earth`s atmosphere in June 1970.

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