The subionospheric electromagnetic response to magnetopause processes

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Electric Fields, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Magnetopause, Plasma Interactions, Solar Wind, Cylindrical Bodies, Hydrodynamics, Magnetic Flux, Magnetohydrodynamic Flow, Perturbation, Polar Regions, Series Expansion, Wind Pressure

Scientific paper

The correlation between high latitude impulsive events, the interplanetary magnetic field, and solar wind plasma properties was studied based on the data acquired from the 1985 to 86 Balloon Campaign at South Pole Station. An independent cylindrical current model in the ionosphere was studied analytically to calculate balloon altitude electric field and ground magnetic field perturbations. The monopole term of the general series expansion of any cylindrical current model produces a single convection vortex pattern on the ground that is consistent with the FTE model suggested by Lanzerotti et al. The dipole term of the general series expansion produces a twin vortex model in the ionosphere. Model studies show that the horizontal electric field in the ionosphere maps down to approx. 30 km with little attenuation. Statistics and detailed case studies show that high latitude impulsive events may come from magnetic field reconnection or solar wind pressure variations. Study also reveal the hydrodynamic reason for the motion of magnetic flux ropes in the ionosphere. Solar wind plasma flow pushes a magnetic flux tube to move westward in the morning and to move eastward in the afternoon.

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