INTERCOSMOS-COPERNICUS 500 spacecraft aimed at observations of solar radio bursts at r.f. frequencies and plasma resonances in the upper ionosphere. Poland provided the r.f. radiospectrometer. The spacecraft was launched on April 19, 1973 to commemorate the 500th anniversary of Copernicus birth. The obtained data allowed to estimate the strength and polarisation of the solar type III burst. It was the very first Polish instrument on a satellite board.