Arbitrary amplitude ion acoustic solitary structures in a collisionless magnetized plasma consisting of nonthermal and isothermal electrons

We have used the Sagdeev pseudo-potential technique to investigate the arbitrary amplitude ion acoustic solitons, double layers and supersolitons in a collisionless magnetized plasma consisting of adiabatic warm ions, isothermal cold electrons and nonthermal hot electrons immersed in an external uniform static magnetic field. We have used the phase portraits of the dynamical system describing the nonlinear behaviour of ion acoustic waves to confirm the existence of different solitary structures. We have also investigated the transition of different solitary structures: soliton (before the formation of double layer) $ ightarrow$ double layer $ ightarrow$ supersoliton $ ightarrow$ soliton (soliton after the formation of double layer) by considering the variation of $ heta$ only, where $ heta$ is the angle between the direction of the external uniform static magnetic field and the direction of propagation of the wave.