Electric field screening by a proton counterflow in the pulsar polar cap

Abstract

We propose a new mechanism to screen the electric field in the pulsar polar cap. Previous studies have shown that if an electron beam from the stellar surface is accelerated to energies high enough to create electron-positron pairs, the required electric field parallel to the magnetic field lines is too strong to be screened out by the produced pairs. We argue here that if non-relativistic protons are supplied from the magnetosphere to flow towards the stellar surface, they can provide an anode to screen out such a strong electric field. Injected electron-positron pairs yield an asymmetry of the electrostatic potential around the screening point. The required pair creation rate in this model is consistent with the conventional models.

arXiv comment11 pages, 4 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (6)

• Atmospheres and Spectra of Strongly Magnetized Neutron Stars
• Proton Cyclotron Features in Thermal Spectra of Ultra-magnetized Neutron Stars
• New Evidence for Proton Cyclotron Resonance in a Magnetar Strength Field from SGR 1806-20
• Evidence of a cyclotron feature in the spectrum of the anomalous X-ray pulsar 1RXS J170849-400910
• On the Electric Field Screening by Electron-Positron Pairs in the Pulsar Magnetosphere II
• Electrostatic Instability in Electron-Positron Pairs Injected in an External Electric Field

Cited by in corpus (1)

• Coherent Curvature Radiation and Proton Counterflow in the Pulsar Magnetosphere