A model current system for the magnetospheric substorm

Physics

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Atmospheric Models, Auroral Electrojets, Earth Magnetosphere, Ionospheric Currents, Magnetic Storms, Current Distribution, Field Aligned Currents, Geomagnetism, Incoherent Scattering, Polar Substorms, Radar Scattering

Scientific paper

A model three-dimensional current system for the magnetic substorm is constructed to account for the field-aligned currents and ionospheric currents indicated by incoherent scatter radar data obtained at Chatanika, Alaska and the global distribution of auroras with respect to auroral electrojets appearing in DMSP satellite photographs. The ionospheric current pattern is calculated. The auroral electrojets are shown to be strongly asymmetric with respect to the midnight meridian. In the late evening sector the eastward current is deflected at the poleward boundary of the diffuse auroral region. A concentrated westward current flows along the discrete aurora, extending from the westward current in the early morning sector. The boundary between the eastward and westward currents in the evening sector is the Harang discontinuity. The field-aligned currents are closed by a combination of east-west and north-south paths in the ionosphere.

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