Observations of pulsating aurora in the day sector auroral zone

Physics

Scientific paper

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Auroral Zones, Daytime, Electron Precipitation, Proton Precipitation, Atmospheric Ionization, E Region, F Region, Graphs (Charts), Magnetic Storms, Magnetometers, Riometers, Visual Photometry

Scientific paper

Utilizing a unique set of photometric and riometer observations obtained just after twilight (1300-1600 M.L.T.) at College, Alaska, the occurrence of pulsating auroras in the afternoon sector of the auroral zone is documented for the first time. A consistent tendency for the auroral pulsations to terminate as the earth's shadow passes through the E- and F-layers is interpreted in terms of the precipitation pulsation mechanism proposed by Coroniti and Kennel (1970) and the cold plasma injection theory of Brice and Lucas (1971).

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