ON THE TRANSFORMATION OF PLANETARY-WAVES OF TROPOSPHERIC ORIGIN INTO WAVES IN RADIO-WAVE ABSORPTION IN THE LOWER IONOSPHERE

Calculations are carried out of upward propagation of a tropospherical ly forced 10-day planetary wave into the upper middle atmosphere with the use of the COMMA-R model of the University of Cologne, of its tran sformation into a wave in electron density by means of the model of th e Comenius University, and of its final transformation into a wave in radio wave absorption in the lower ionosphere applying the computer co de of the Geophysical Institute. The calculations show that the absorp tion may be used for investigating the planetary wave activity, partic ularly of its long-term trends. The possibility of propagation of plan etary waves from the winter hemisphere to the summer hemisphere is ill ustrated, which could contribute to explanation of the occurrence of t ravelling planetary waves in the mesosphere in summer.