The eastward movement of the structure of auroral radio absorption events in the morning sector

Physics

Scientific paper

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Auroral Absorption, Ionospheric Drift, Morning, Particle Motion, Radio Attenuation, Electron Energy, Electron Precipitation, Magnetic Storms, Riometers

Scientific paper

The motion of auroral radio absorption events in the morning sector has been studied using riometer stations separated by about 250 km. The velocity of individual absorption peaks tends to be lower towards the end of the event, which is consistent with a mechanism whereby the auroral particles are injected near midnight and drift eastward in the closed magnetic field. However, it is difficult to reconcile the actual velocities with those measured on geostationary satellites in the equatorial plane. It appears that the structure in the electron precipitation moves considerably slower than magnetospheric plasma clouds of similar energy.

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