Nonlinear drift-Alfven waves in magnetized electron-positron plasmas

Nonlinear drift-Alfven waves in an inhomogeneous, relativistic low-pressure electron-positron plasma are studied. A set of coupled nonlinear equations describing these waves are deduced. It is shown that the nonlinear equatio ns for stationary drift-Alfven waves are similar to those for shear Alfven and drift-Alfven waves in an electron-ion plasma or shear Alfven waves in a n electron-positron plasma. Dipolar drift-Alfven vortices can thus exist in relativistic electron-positron plasmas.