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The kinematic behavior of superluminal components observed at 43 GHz inblazar 3C454.3 were model-fitted with their light curves interpreted in termsof their Doppler-boosting effect. The relation between the flux evolution ofsuperluminal components and their accelerated/decelerated motion or theincrease/decrease in their Lorentz/Doppler factor was investigated. Theprecessing jet-nozzle scenario previously proposed by Qian et al. (1991, 2018a,2021) and Qian (2018b, 2022a, 2022b) was applied to consistently model-fit thekinematic behavior and light curves for two superluminal components (B4 and B6)measured by Jorstad et al. (2005). For both B4 and B6 which were ascribedrespectively to the jet-A and jet-B of the double-jet structure assumed for3C454.3, their kinematic features were well model-fitted with their bulkLorentz factor and Doppler factor (as function of time) convincingly derived.It is shown that the light curves of the radio bursts associated with knot B4and knot B6 can be well explained in terms of their Doppler boosting effect.Similarly, for the knot R3 observed at 15GHz (Qian et al. 2014, Britzen et al.2013) the interpretation of its kinematic behavior and light curve is presentedin the Appendix. We emphisize that the interpretation of the flux evolution ofsuperluminal components combined with the model-fit of their kinematics isimportant and fruitful. This kind of combined investigation not only cangreatly improve the model-simulation of their kinematics with properlyselecting the model parameters (especially the bulk Lorentz factor and Dopplerfactor as function of time), but also their light curves can be wellinterpreted in terms of their Doppler-boosting effect. Therefore, we can almostcompletely (or perfectly) understand the physical nature of these components:their kinematic/dynamic characteristics and emission properties.

Flux evolution of superluminal components in blazar 3C454.3