Nocturnal high-latitude E-region in winter during extremely quiet conditions

Physics

Scientific paper

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Auroral Zones, E Region, Eiscat Radar System (Europe), F Region, Ionospheric Electron Density, Night Sky, Ionospheric Ion Density, Nocturnal Variations, Winter

Scientific paper

The EISCAT UHF radar data for December 9-17, 1990 were used to study the quiet night-time E-region at high latitudes. Results include information on the electron density in the F-region, on layered structures in the E-region, and on ion densities in thin layers. Observations include the nighttime appearance of steeply descending 'intermediate layers' merging to the lower lying sporadic-E. The intermediate layers differ from the main layers by their rapid downward motion and a repetition period of about an hour, both properties suggesting that the layers are caused by gravity waves.

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