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Deep Very Large Array imaging of the binary X-ray source SS 433, sometimesclassified as a microquasar, has been used to study the intrinsic brightnessdistribution and evolution of its radio jets. The intrinsic brightness of thejets as a function of age at emission of the jet material tau is recovered byremoval of the Doppler boosting and projection effects. We find thatintrinsically the two jets are remarkably similar when compared for equal tau,and that they are best described by Doppler boosting of the form D^{2+alpha},as expected for continuous jets. The intrinsic brightnesses of the jets asfunctions of age behave in complex ways. In the age range 60 < tau < 150 days,the jet decays are best represented by exponential functions of tau, but linearor power law functions are not statistically excluded. This is followed by aregion out to tau ~ 250 days during which the intrinsic brightness isessentially constant. At later times the jet decay can be fit roughly asexponential or power law functions of tau.

Structure and Magnetic Fields in the Precessing Jet System SS 433 II. Intrinsic Brightness of the Jets