Volume 411, Number 2, November IV 2003
|Page(s)||203 - 213|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
Cross-field charge transport by the diocotron instability in pulsar magnetospheres with gaps*
Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
2 DARC, Observatoire de Meudon, place Jules Jansen, 92195 Meudon, France
Corresponding author: J. Pétri, firstname.lastname@example.org
Accepted: 30 July 2003
In a previous work, we have shown by linear analysis that a thin charged disk in differential rotation in the magnetosphere of a neutron star with vacuum gaps is unstable to a collisionless instability induced in non-neutral plasmas by differential rotation, the diocotron instability. In this paper we study the long-time-scale evolution of this instability in the non-linear regime by means of both direct numerical simulations and a quasilinear model. We show that, when the disk is externally fed with charged particles produced by a moderate pair creation activity in the magnetosphere, the diocotron instability causes diffusion of the charged particles across the magnetic field lines outwards. An equatorial cross-field electric current is observed to form, carrying a net charge flux radially outwards. This constitutes a hitherto ignored charge transport mechanism in the pulsar magnetosphere. We briefly discuss how this turbulent charge transport mechanism could bear on the problem of electric current closure in pulsar's magnetospheres.
Key words: stars: pulsars: general / plasmas / magnetohydrodynamics (MHD) / methods: numerical
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.