Magneto-modulational instability in Kappa distributed plasmas with self-generated magnetic fields

The behavior of magnetic fields generated by high-frequency transverse plasmons in Kappa distributed plasmas can be described by generalized Zakharov equations, which have considered the nonlinear wave-wave, wave-particle interactions in the kinetic regime and the effects of superthermal electrons. Modulational instability of the spontaneous magnetic fields is investigated on the basis of the equations. The effect of the superthermal electrons on the modulational instability is discussed and a comparison with previous results is presented. It is shown that the characteristic scale and maximum growth rate of the magnetic fields depend on the energy density of transverse plasmons and the superthermal index κ.