Electromagnetic structures at auroral latitudes from the Intercosmos-Bulgaria-1300 satellite data

Computer Science

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Auroral Zones, Electromagnetic Fields, Geomagnetic Latitude, Plasma-Electromagnetic Interaction, Satellite Observation, Signal Analysis, Bulgaria, Electric Field Strength, Intercosmos Satellites, Magnetic Disturbances, Magnetohydrodynamic Waves, Phase Shift

Scientific paper

An analysis is made of intense electromagnetic perturbations in the auroral region at a height of about 900 km that have been recorded by the Intercosmos-Bulgaria-1300 satellite. An attempt is made to determine the common characteristics of their structures; a class of events is identified in which the electric and magnetic field perturbations have the same shape. These are shown to be a result of the propagation of oblique Alfven waves. The absence of an apparent correlation between the mutually perpendicular components of the electric and magnetic fields is explained by a considerable phase shift between the electric and magnetic field perturbations, indicating an interference between the incident wave and the wave reflected by the ionosphere.

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