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In recent experiments of laser pulse interaction at relativistic intensitieswith a low density plasma, the proton radiography technique showed evidence oflong--lived field structures generated after the self-channeling of the laserpulse. We present 2D particle-in-cell simulations of this interaction regime,where the dynamics of similar structures has been resolved with high temporaland spatial resolution. An axially symmetrical field pattern, resembling bothsoliton-like and vortex structures, has been observed. A study of the physicsof such structures and a comparison with experimental data is in progress.Comment: To appear in the Proceedings of the International Workshop  "Collective phenomena in macroscopic systems", Villa Olmo, Como, Italy,  December 4-6, 2006; 9 pages, 8 figures submitted in GIF forma

GENERATION AND OBSERVATION OF COHERENT, LONG–LIVED STRUCTURES IN A LASER–PLASMA CHANNEL