ON THE EVOLUTION OF THE MAGNETIC-MOMENT OF PULSARS

We have derived an analytic equation for time evolution of inclination angle xi between the magnetic moment and the spin axis of radio pulsa rs under the assumption of magnetic dipole braking model. We find that xi is sensitive to the characteristic time t(c) and the initial incli nation angle xi(0) for a magnetic dipole torque. We note the maximum e ffect of alignment torque for pulsars born as almost orthogonal rotato r. Implications of the alignment scenario are discussed.