  Microplasmas operated at atmospheric pressure show a number of peculiar
dynamic phenomena. One of these phenomena is self-pulsing, which is
characterized by intrinsic pulsing behavior of a DC driven plasma discharge.
This work focuses on the numerical simulation of self-pulsing in a micro thin
cathode discharge operated in atmospheric pressure argon. By means of a hybrid
plasma model we show self-pulsing of the discharge in the expected MHz
frequency range and described its actual origin.
