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The theory of self-focusing on striations for the powerful radio wave beam propagating in the northern or midlatitude ionosphere is developed. It is demonstrated that focusing lead to formation of a large scale nonlinear structure aligned magnetic field. It consists of a number of closely packed solitons - bunches of striations. The anomalous absorption of a pump wave trapped in solitons lead to the strong ohmic heating of electrons in the focused region. The theory is in a good agreement with the results of recent observations of optic emission and temperature enhancement in northern ionospheric modification experiments.