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The estimated brightness of the Cygnus loop supernova remnant (SNR) at 2720,1420, 820, 408 and 34.5 MHz are presented. The observations of the continuumradio emission are used to calculate the mean brightness temperatures andsurface brightnesses of this loop at the five frequencies in wide spectralrange, using the method we have previously developed for large radio loops. Thespectrum for mean temperatures versus frequency between the five frequencies isestimated and the spectral index of Cygnus loop is also obtained. Also, fromour results can be concluded that Cygnus loop evolves in the low densityenvironment and the initial energy of supernova explosion was relatively low.The obtained results confirm non-thermal origin of the Cygnus radio loop andshow that our method is applicable to almost all remnants.

Temperature, brightness and spectral index of the Cygnus radio loop