STATISTICS OF PSR-1133+16 MICROPULSE EMISSION DETERMINED AT WIDELY SPACED FREQUENCIES

We have investigated the statistics of signals obtained with high time resolution at 1400 MHz and at 102.5 MHz from the pulsar PSR 1133+16 a t pulse longitudes corresponding to both components of the average pul se profile. Observations were not simultaneous at both frequencies. We have determined the probability for the presence of microstructure an d for the presence of quasi-periodicities for the two observing freque ncies. Probability of microstructure appearance has been determined to be the cause of decrease of the average microstructure component at h igh frequencies. We show that the distribution of characteristic times of microstructure is substantially different for pulse components I a nd II of the average pulse profile at 1400 MHz, although the probabili ty for the presence of microstructure and for the presence of quasi-pe riodicities is independent of the longitude of the pulse component. Th e average characteristic time of microstructure is the same at both pu lse component longitudes at both frequencies. The observations are int erpreted in terms of pulsar emission models.