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We consider the classical picture of three dimensional motion of chargedparticles in pulsar magnetosphere. We adopt a perturbative method to solve theequation of motion, and find the trajectory of particles as they move along therotating dipolar magnetic field lines. Our aim is to study the influence ofrotation on the pulsar radio emission by considering the constrained motion ofparticles along the open dipolar magnetic field lines. We find that therotation induces a significant curvature into the particle trajectories. Ourmodel predicts the intensity on leading side dominates over that of trailingside. We expect that if there is any curvature induced radio emission from theregion close to the magnetic axis then it must be due to the rotation inducedcurvature. Our model predicts the radius--to--frequency mapping (RFM) in thecore emissions.Comment: 16 pages, 11 figures, Accepted for publication in Astronomy and  Astrophysics (2007

Dynamics of charged particles in the radio emission region of pulsar magnetosphere