Ultrarelativistic envelope solitons in electron-positron plasma of the pulsar magnetosphere

The non-linear propagation of intense electromagnetic radiation in pulsar magnetosphere is investigated. The radiation is considered to be a circularly polarized electromagnetic wave, in whose field electron and positron acquire ultrarelativistic velocities. The non-linear frequency shift due to the wave plasma interaction is found to cause the wave localization and it produces a new kind of envelope soliton, which in coupling with the ambient magnetic field generates intense ambipolar field along the magnetic lines. (author). 9 refs