The satellite CORONAS-I was launched on March 2, 1994. Its task was to study physical processes on the Sun and their influence on the Earth. Poland provided two instruments located on board the spacecraft. The first one, the X-ray spectro-dopplerometer DIOGENES, is aimed at studying the energy transfer in solar flares. The other one, the radio-spectrometer SORS-D, aimed at measuring the radio emission from the outer regions of solar corona and ionospheric effects of solar flares.