Radio loud and radio quiet pulsars with hard emission

Two parameters such as magnetic fields near the light cylinder Blc and rates of rotational energy losses <mml:mfrac>dEdt</mml:mfrac> for 1795 radio pulsars without high energy emission (R), 52 radio loud gamma-ray pulsars (gamma +R), 33 radio quiet gamma-ray pulsars (gamma) and 61 radio loud X-ray pulsars (X+R) are compared with each other in this work. Pulsars with registered X-ray and gamma-ray emission have the higher median values of Blc and <mml:mfrac>dEdt</mml:mfrac> as compared to the population of ordinary radio pulsars. There is a trend of increasing of luminosities in X-ray and gamma-ray ranges for higher values of magnetic field near the light cylinder. We hypothesize that non-thermal X-ray and gamma-ray emissions are generated near the light cylinder by the synchrotron mechanism.