Flux variability from ejecta in structured relativistic jets

We investigate the light curves of a variable stratified relativistic jet by means of relativistic magneto-hydrodynamics simulations. Indeed, astrophysical jets in active galactic nuclei seem to be transversely stratified, with a fast inner jet and a slower outer jet. As it is likely that the launching mechanism for each component is different. In the other hand, the steady and moving knots properties are observed  along these jets. 
Results: With the proposed model, we were able to explain the observed asymmetry flares in radio resulting from interaction between moving and standing shock. This asymmetry results from remnant emission of the shocked standing shocks.