Relativistic excitation of envelope solitons in electron-positron plasmas of the pulsar magnetosphere

Abstract
The nonlinear propagation of an external magnetic-field-aligned circularly polarized electromagnetic wave in electron-positron plasma is investigated. Relativistic and the time-derivative ponderomotive nonlinearities are considered. A new kind of envelope soliton in the magnetoactive plasma is obtained. A large-amplitude localized electromagnetic radiation may exist in the pulsar magnetosphere.