160-MIN VARIATION OF THE RIOMETER ABSORPTION

From the ground riometer measurements of cosmic radio noise level at the frequency of 32 MHz at Tixie station, the 160-min oscillation and its 80-min mode have been revealed. It is shown that such oscillations can arise due to pulsations of (1) radio noise source proper, (2) neutral atmosphere parameters, and (3) precipitation particle fluxes. The influence of each of the above factors on the level of cosmic radio noise oscillations is discussed.