A survey of existing observations of microstructure in pulsars which display a quasi-periodic feature with an average period around 0.9 msec is presented, along with several possible physical explanations. Stellar objects which have been observed to have the quasi-periodicity are listed, and the features are noted to be either a sequence of microbursts with constant time separation, to have sudden phase steps, or to follow random time intervals with continuous variability or with random variability. The quasi-periodicities have been seen to exist simultaneously, and do not occur at longitudes where other bursts are not observed. Polarization has been detected to preferentially change state at the edges of micropulses and subpulses. Finally, it is noted that data shows that quasi-periodicities have the same period at different radio frequencies in different pulsars.
Pulsars: 13 Years of Research on Neutron Stars
- Pub Date:
- Periodic Variations;
- Polarized Electromagnetic Radiation;
- Pulsed Radiation;
- Radio Frequencies;
- Stellar Radiation;