On the nature of radio pulsars with long periods
  It is shown that the drift waves near the light cylinder can cause the modulation of the emission with periods of the order several seconds. These periods explain the intervals between successive pulses observed in "magnetars" and radio pulsars with long periods. The model under consideration makes it possible to calculate the real rotation periods of the host neutron stars. They are less than 1 sec for the investigated objects. The magnetic fields at the surface of the neutron star of the order 10^(11)-10^(13) G and equal to the usual fields for known radio pulsars 
D.Lomiashvili, G.Machabeli, I.Malov