We use the low frequency ( 110–180 MHz ) capabilities of the Westerbork Synthesis Radio Telescope ( WSRT ) to characterise a large collection of single pulses from three low magnetic field pulsars .
Using the Pulsar Machine II ( PuMa-II ) to acquire and coherently dedisperse the pulsar signals , we examine whether the bright pulses observed in these pulsars are related to the classical giant pulse emission .
Giant pulses are reported from PSR B1112 + 50 and bright pulses from the PSRs B1133 + 16 and B0031 - 07 .
These pulsars also exhibit large intensity modulations observed as rapid changes in the single pulse intensity .
Evidence of global magnetospheric effects is provided by our detection of bright double pulses in PSRs B0031 - 07 and B1133 + 16 .
Using the multi-frequency observations , we accurately determine the dispersion measures ( 4.844 \pm 0.002 for B1133 + 16 and 9.1750 \pm 0.0001 for B1112 + 50 ) , derive the radio emission height in PSR B1133 + 16 and report on the properties of subpulse drift modes in these pulsars .
We also find that these pulsars show a much larger intensity modulation at low sky frequencies resulting in narrow and bright emissions .