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This paper aims to give a brief review of a new concept for the preliminarydetermination of the evolutionary status of supernova remnants (SNRs). Dataobtained by radio observations in continuum are used. There are three differentmethods underlying the new concept: the first one based on the location ofobservationally obtained radio surface brightness and corresponding diameter ofan SNR on the theoretically derived Sigma-D tracks; the second one based on theforms of radio spectra; and the third one, based on the magnetic fieldstrengths that are estimated through the equipartition (eqp) calculation. Usinga combination of these methods, developed over the last two decades by theBelgrade SNR Research Group, we can estimate the evolutionary status of SNRs.This concept helps radio observers to determine preliminarily the stage of theevolution of an SNR observed in radio domain. Additionally, this concept wasapplied for several SNRs, observed by the Australia Telescope Compact Array(ATCA), and the corresponding results are reviewed here. Moreover, some of theresults are revised in this review to reflect the updated recently publishedSigma-D and eqp analyses.

On the Determination of the Evolutionary Status of Supernova Remnants from Radio Observation Data