Dynamics of large-scale vortical structures in electron-positron-ion plasmas

To describe the nonlinear propagation of electrostatic drift waves the generalized Hasegawa-Mima equation containing both vector (Jacobian) and scalar (Korteweg-de Vries-type) nonlinearities is obtained for electron-positron-ion plasmas. The drift waves are supposed to have arbitrary wavelengths (as compared with the Larmour radius of plasma ions at the plasma electron temperature). Temperature inhomogeneity of electrons and positrons is taken into account. Spatial increase in the linear plasma-potential perturbations in the direction of density and temperature inhomogeneities is shown. Self-organization mechanism of large-scale drift solitary vortices is considered. It is shown that the existence of positrons in plasma enriches the class of solutions of the generalized Hasegawa-Mima equation.