Electric field configuration and plasma parameters in the vicinity of a faint auroral arc

Computer Science – Sound

Scientific paper

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Atmospheric Electricity, Auroral Arcs, Electric Fields, Ionospheric Sounding, Space Plasmas, Eiscat Radar System (Europe), Electron Energy, Ionospheric Electron Density, Plasma Drift, Rocket Sounding

Scientific paper

To study auroral arc physics, coordinated rocket and EISCAT measurements were made across a faint arc. Observed plasma parameters and dc electric fields from both methods are discussed. The precipitation event was a moderate one and obviously a localized and temporary disturbance. The electric field configuration in the vicinity of the associated arc measured on board the rocket payload (apogee at 703 km) and deduced from EISCAT measurements of the plasma drift are discussed. The main features of the electric field in the arc region can be explained by polarization fields, but there is also some evidence of field-aligned electric fields.

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