Periodic kinetic Alfven waves and overtaking between multi-solitons in nonthermal electron-positron-ion plasma

In this paper, the formation of periodic (cnoidal) and solitary kinetic Alfven waves (KAWs) in nonthermal electron-positron-ion plasma has been illustrated. The KdV equation has been derived by using the reductive perturbation technique. The Sagdeev potential method is used to obtain the solution of KdV equation for examining the dynamics of periodic KAWs. Further, Hirota bilinear method is applied to examine the overtaking process and the expressions of phase shifts of multi-solitons have been determined. Only positive potential kinetic Alfvenic (KA) solitary and periodic waves are evolved in the given plasma environment. The influence of plasma beta, positron density, angle of propagation, nonthermality of electrons and positrons has been investigated on the behaviour of periodic (cnoidal) KAWs. The combined impact of density, nonthermality of electrons as well as positrons has vastly modified the phase shifts of double-as well as triple-solitons. This investigation may have applications for particle acceleration and energy transportation in galactic nucleus and interstellar medium where nonthermal electron and positron pairs exist.

Automated summary

This paper investigates the formation and dynamics of periodic and solitary kinetic Alfven waves in nonthermal electron-positron-ion plasma. The KdV equation is derived using the reductive perturbation technique, and the Sagdeev potential and Hirota bilinear methods are applied to examine the wave dynamics. The study reveals that the plasma beta, positron density, propagation angle, and nonthermality of electrons and positrons have a significant influence on the behavior of the waves.