Abstract
The nonlinear propagation of intense electromagnetic waves and modulational instability in a rotational ultra-relativistic magnetized electron-positron plasma of a pulsar magnetosphere have been theoretically investigated by deriving and solving nonlinear Schrodinger equation. It has found that the electromagnetic waves propagation in such a plasma system are modulationally unstable, and the model leads to electromagnetic solitons under the condition of extreme rotation. It is noticed that high amplitude solitons are produced in the pulsar magnetosphere. It is also found that the solitons amplitude increased rapidly while their widths become narrower with the increased of pulsar rotation that are related to the pulsar radiation (electromagnetic radiation). The solitons that may exist in pulsar magnetosphere are briefly discussed.
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