The magnetic field on the magnetospheric boundary from laboratory simulation data

Physics

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Collisionless Plasmas, Earth Magnetosphere, Geomagnetism, Magnetic Field Configurations, Magnetohydrodynamic Flow, Convection, Electric Fields, Heos Satellites, Magnetic Flux

Scientific paper

A simulation experiment has studied the magnetospheric boundary for high Alfven Mach numbers. The artificial magnetosphere was produced as a result of interacting a supersonic and super-Alfvenic flow of collisionless plasma with a dipole magnetic field. In the presence of southward magnetic-field components, a 'visor' forms on the dayside in the plasma flow, preventing reconnection at the front side of the magnetosphere. Field lines of the plasma flow envelop the polar cap, forming a mantle. In the presence of northward field components the convection in the polar cap is sunward, while with southward components convection is antisunward. Simultaneously with the convection caused by reconnection, convection due to viscous interaction is observed along the boundary, and clearly in the region of closed field lines

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