Numerical simulation of large-scale field-aligned current generation from finite-amplitude magnetosonic waves

Details Numerical simulation of large-scale field-aligned current generation from finite-amplitude magnetosonic waves Numerical simulation of large-scale field-aligned current generation from finite-amplitude magnetosonic waves

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..851y&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 10, p. 851-854

Other

2

Earth Magnetosphere, Environment Models, Field Aligned Currents, Geomagnetism, Magnetoelastic Waves, Magnetohydrodynamic Flow, Plasma Currents, Plasma Waves, Solar Terrestrial Interactions, Solar Wind, Two Dimensional Models, Computerized Simulation, Convective Flow, Magnetic Field Configurations, Magnetic Storms

Scientific paper

A two-dimensional numerical simulation of finite-amplitude magnetohydrodynamic (MHD) magnetosonic waves is performed under a finite-velocity background convection condition. Isothermal cases are considered for simplicity. External dissipation is introduced by assuming that the field-aligned currents are generated in proportion to the accumulated charges. The simulation results are as follows: Paired field-aligned currents are found from the simulated waves. The flow directions of these field-aligned currents depend on the angle between the background convection and the wave normal, and hence two pairs of field-aligned currents are found from a bowed wave if we look at the overall structure. The majority of these field-aligned currents are closed within each pair rather than between two wings. These features are not observed under slow background convection. The result could be applied to the cusp current system and the substorm current system.

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