Shapes of mean pulse profiles of pulsar radio emission at the frequency 102.5 MHz

The mean pulse profiles of 83 pulsars are presented at a result of the Northern pulsars survey at 102.5 MHz. The comparison with the 408 MHz data shows that in most cases are substantial variations of width and form of profiles. Many pulse profiles (80%) keep a number of components but as a rule the relative amplitudes of the pulse components can change considerably from 102 to 408 MHz. There is a number of pulsars for which the profile becomes more complex or simple. In the average the pulse width (at the 10% level) W0.1 increases with decreasing frequency with the index β0.1=0.19±0.02, i.e. W0.1 ∝ v-β0.. The statistical correlation between the spectral index and α and β0.1 was found in the range 102 to 408 MHz