RT Journal Article ID 6499d96f49e7e0cf A1 Bovkoon, V. P. A1 Boobnov, I. N. A1 Zhouck, I. N. A1 Konovalenko, Alexandr A. T1 EVOLUTION OF RADIO EMISSION OF CASSIOPEIA A SUPERNOVA REMNANT BY FIFTY-YEAR OBSERVATIONS NEAR FREQUENCIES 12.6, 14.7, 16.7, 20, AND 25 MHZ JF Radio Physics and Radio Astronomy JO RPRA YR 2011 FD 2011-02-24 VO 2 IS 1 SP 3 OP 14 K1 supernova remnant K1 evolution of radio emission K1 Cassiopeia A K1 decameter wavelengths AB The results of measurements in the ratios of flux densities of Cas A supernova remnant and Cyg A radio galaxy during 1959.5−2009.4 at frequencies 12.6, 14.7, 16.7, 20, and 25 MHz are shown. The radio telescopes used in these measurements are briefly mentioned. Strong variations in Cas A flux densities at decameter wavelengths are shown to be observed. The average drop rate of Cas A flux density for a 50-yr period has been determined. For the decameters, it makes (0.81 ± 0.04) % per year, being frequency independent within the measuring errors. PB Begell House LK https://www.dl.begellhouse.com/journals/6fd1549c0e2c05da,059550b43d2daa52,6499d96f49e7e0cf.html