Abstract
The structures of knots in astrophysical jets can be modelled as internal shock waves that result from a time variability of the jet source. Previous work has provided an understanding of jet flows ejected from sources with a periodic variability. This paper is concerned with jets from sources with non-periodic variabilities. With a simple analytic formalism based on solutions of the Boltzmann and the inviscid Burgers equation, it is possible to find self-similar solutions that describe the spatial and velocity distributions of the knots as a function of distance from the source
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