A possible mechanism for flattening of pulsar spectra at high frequencies

A model for synchrotron radiation by secondary-plasma relativistic electron s is proposed as an explanation of the observed flattening of radio pulsar spectra at high frequencies. The spectral luminosities observed at 43 GHz a nd calculated using the model can be brought into agreement if the pitch an gles of the electrons are psi = 0.04-0.4 rad. The model predicts a decrease of the synchrotron luminosity with increasing period; this is tentatively confirmed by observational data for three pulsars.