Abstract
Observations are reported on hydrogen emissions in aurorae and airglow made with a scanning spectrometer during the period 10–24 February 1958 at Churchill, Manitoba. No systematic relationship between the occurrence of the H β line and the usual auroral forms was noted, with the exception of very strong active displays in which hydrogen emissions were not observed. Measurements of the intensity and profile of the H β line indicate that a proton flux of some 10 7–10 8 protons/cm 2 sec, with some protons having an initial velocity of ≥3000 km/sec, are associated with some auroral displays. Strong hydrogen emissions, along with enhanced airglow radiations, were detected during an interval of no visible aurorae. Assuming that light scattering played an important role in the measurements, the H α and H gb line profiles can be explained by an influx of monoenergetic protons having an initial velocity of about 1200 km/sec. The flux for the beginning of the enhanced radiations was calculated to be the order of 10 8 protons/cm 2 sec.
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