Polar aurora and F-layer dynamics studies at Eureka, Canada

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Abstract
A polar observatory has been in operation at Eureka (89 degree(s) north magnetic latitude) since 1990, with two studies centering on the dynamics of polar arcs and F-layer patches. Instrumentation has included all-sky imagers and multichannel scanning photometers. A recent addition has been a turntable photometer mount which permits continuous scanning along the dawn-to-dusk meridian. This is optimum for high resolution studies of sun-aligned auroral arcs and other particle precipitation affects poleward of the auroral oval. F-layer patches (whose optical signature are typically 100 - 300 R enhancements in 630 nm emission and lesser 558 nm enhancements) are frequently seen drifting across the pole in an antisunward direction, often in sequences and sometimes recurring through much of the 24-hr period. The instrumentation and results from these studies obtained over the 1993-94 winter are discussed.

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