Nonlinear solitary waves (solitons) in inhomogeneous magnetized warm plasma with negative ions and nonisothermal electrons

Abstract

The effect of ion temperature together with the concentration of low temperature nonisothermal electrons and their temperature contributions to the excitation of nonlinear solitary waves is studied in an inhomogeneous plasma having negative ions under the influence of a magnetic field. Unlike usual negative-ion-containing plasmas, the present plasma with nonisothermal electrons does not support the rarefactive solitons and only the compressive solitons evolve for two types of modes called the fast mode and slow mode. The fast compressive solitons corresponding to the fast mode propagate with higher amplitude in comparison with the slow compressive solitons, which occur only under a limiting condition on the obliqueness of the wave propagation with the magnetic field. The effect of ion temperature is found to be more significant when fewer negative ions are present in the plasma. Both solitons are found to be sensitive to the concentration and thermal motions of the low temperature electron species. With regard to the dependence of soliton characteristics on the magnetic field, it is observed that both solitons evolve with larger size when the wave propagates at a larger angle to the magnetic field and the magnetic field effect is found to narrow the solitons.