Inductive electric field at the magnetopause

Computer Science – Sound

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Atmospheric Electricity, Electric Fields, Magnetopause, Satellite Sounding, Boundary Layer Flow, High Resolution, International Sun Earth Explorer 1, Magnetic Induction, Magnetosheath, Plasma Dynamics, Temporal Distribution

Scientific paper

The electric field data for two crossings of the magnetopause by ISEE-1 on November 20, 1977, have been analyzed with high time resolution. In both cases the electric field has a negative dawn-dusk component in the boundary layer, so it must reverse somewhere within the current layer to the positive value outside. If there is a component parallel to the moving magnetopause current it is small, and by no means obvious. In the case of the exit crossing from the boundary layer to the magnetosheath the data show that the electric field vector is turning for about two seconds at roughly the satellite spin rate; this changing direction suggests that the electric field has a curl. Such a curl could be caused by a travelling localized perturbation of the magnetopause surface current associated with impulsive plasma transport through the magnetopause.

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