CASSIOPEIA-A FLUX-DENSITY SECULAR DECREASE AND VARIATIONS AT METER WAVELENGTHS

On the basis of long-term (1977-1993) annual observations using the sa me receiving system parameters we observed a slowdown of the flux dens ity decrease of the Supernova Remnant Cassiopeia A. The mean rate of i ntensity decrease at 102 MHz has been found to be equal to (0.8 +/- 0. 12)% per year. It is 2/3 of the value obtained earlier (1949-1980) at a nearby frequency of 81.5 MHz. The observations at 152 and 81.5 MHz a lso show decrease rate of about 0.8 per cent per year. Small-scale tim e variations have been discovered over the secular decrease at 102 MHz . Radio emission Bares occurred approximately in 1981, 1986 and 1991. Their amplitudes amounted only about to 3.5 per cent of the SNR total flux.