Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...445..779f&link_type=abstract
Astronomy and Astrophysics, Volume 445, Issue 3, January III 2006, pp.779-794
Astronomy and Astrophysics
Astrophysics
5
Stars: Pulsars: General, Plasmas, Magnetohydrodynamics (Mhd), Instabilities
Scientific paper
The potential role of a diocotron instability in causing drifting sub-pulses in radio pulsar emission is investigated for aligned magnetic rotators. It is assumed that the out-flowing plasma above a pulsar polar cap consists of an initially axially symmetric, hollow beam of relativistic electron positron pair plasma which carries an electric charge as well as a current. The occurrence of instability depends on shear in the angular velocity distribution of the beam as a function of axial distance. Instability occurs under typical pulsar conditions at mode numbers ≤ 40. It destroys the symmetry of the equilibrium configuration and leads to a carousel of density columns which rotates at fixed angular pattern speed. The process is applied to two pulsars with observed carousels of drifting sub-pulses, and the diocotron instability at corresponding mode number and axial distance is used as a diagnostic for the charge and current density of the polar flow.
Fung P.-K.
Khechinashvili David
Kuijpers Jan
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