Abstract We monitored PSR B0329+54 for four months using the Nanshan 25-m radio telescope at 1540 MHz. The observations reveal three mode changing events, that lasted for 37, 12 and 17 min respectively. The integrated flux densities for the different observations differ greatly from their average value. The modulation indices of individual observations vary in a wide range as well, indicating that the intrinsic flux density is largely modulated by the scintillation effect.
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