Synchrotron radiation from dynamically evolving runaway tails

A quasilinear code (2-D in velocity and wave vector space) based on the Ritz–Galerkin method and finite elements is used to study the synchrotron emission from a dynamically evolving runaway tail. The evolution of runaway tails was studied recently using the same code [Phys. Fluids 28, 3356 (1985)]. The velocity distribution derived from the above code is used to estimate the synchrotron radiation in different time steps. The applicability of these results to the Princeton Large Torus [Phys. Rev. Lett. 49, 1255 (1982)] and solar microwave bursts is also commented on.