The influence of small-scale magnetic field on the heating of J0250+5854 polar cap

The influence of surface small scale magnetic field on the heating PSR J0250+5854 polar cap is considered. It assumed that heated only by reverse positrons, accelerated in pulsar diode. supposed diode stationary state with lower plate nearby star (polar model), occupies all tube crosssection and operates regime steady space charge limited electron flow. electric inside taken into account. To calculate electron-positron pairs production rate we take account curvature radiation primary electrons its absorption field. part electro-positron may be created bound (positronium). And later such positroniums are photoionized thermal photons from surface.