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A rocket-borne auroral particles experiment was fired from Fort Churchill, Canada, over a homogeneous arc at 2000 local time on February 26, 1969. Detectors measured the pitch-angle distribution of the fluxes of electrons with energies of 2–18 and 2 kev) auroral electrons carry a substantial part of the Birkeland current. The intensity and location of the electron fluxes were in reasonable agreement with measurements by ground-based photometers and all-sky cameras. The arc extended at least 1500 km in an east-west direction and was not associated with substorm activity.
Vondrak et al. (Mon,) studied this question.
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