Differential rotation of polar caps of radio pulsars
D.P. Barsukov, O.A. Goglichidze, D.A. Shalybkov, A.I. Tsygan
Ioffe Physical-Technical Institute, Politekhnicheskaya 26, 194021 Saint Petersburg, Russia
We study radio pulsar activity in the frame of
Goldreich-Julian model. We consider free electron emission
from the liquid stellar surface along open magnetic field
lines. Also, we assume the presence of reverse electron
current flows along separatrix between open and closed
regions of magnetic fields lines. Currents enclose mostly in
the deep rigid layers of the star which leads to star
breaking. However, small fractions of magnetic field lines
encloses inside the liquid surface layer. The latter leads
to the differential rotation of the polar cap region near
separatrix.