Numerical Construction of Magnetosphere with Relativistic Two-fluid Plasma Flows

Abstract

We present a numerical model in which a cold pair plasma is ejected with relativistic speed through a polar cap region and flows almost radially outside the light cylinder. Stationary axisymmetric structures of electromagnetic fields and plasma flows are self-consistently calculated. In our model, motions of positively and negatively charged particles are assumed to be determined by electromagnetic forces and inertial terms, without pair creation and annihilation or radiation loss. The global electromagnetic fields are calculated by the Maxwell's equations for the plasma density and velocity, without using ideal MHD condition. Numerical result demonstrates the acceleration and deceleration of plasma due to parallel component of the electric fields. Numerical model is successfully constructed for weak magnetic fields or highly relativistic fluid velocity, i.e, kinetic energy dominated outflow. It is found that appropriate choices of boundary conditions and plasma injection model at the polar cap should be explored in order to extend present method to more realistic pulsar magnetosphere, in which the Poynting flux is dominated.

11 pages, 9 figures

References in corpus (3)

• Three-dimensional numerical simulations of the pulsar magentoshere: Preliminary results
• Relativistic Force-Free Electrodynamic Simulations of Neutron Star Magnetospheres
• Jets and Disk-Winds from Pulsar Magnetospheres

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• A multi-dimensional numerical scheme for two-fluid Relativistic MHD
• Method of the Particle-in-Cell Simulation for the Y-point in the Pulsar Magnetosphere
• Axisymmetric force-free magnetosphere of a pulsar. II. Transition from the self-consistent two-fluid model
• Multicomponent theory of buoyancy instabilities in magnetized plasmas: The case of magnetic field parallel to gravity
• Multi-wavelength emission region of gamma-ray emitting pulsars
• Inductive acceleration of ions in Poynting-flux dominated outflows
• Physics of radio emission in gamma-ray pulsars
• Outgoing electromagnetic power induced from pair plasma falling into a rotating black hole
• Two-fluid model of the pulsar magnetosphere represented as an axisymmetric force-free dipole