Abstract:
The variations of the forbidden oxygen lines in the nightglow are investigated photoelectrically using a fixed orientation photometer set in a star free region near the north celestial pole. For the red lines our observations show that the slope of the evening twilight enhancement portion of the diurnal curve indicates a possible change with season; for the 5577 Å emission, the occurrence of a maximum around midnight is confirmed. Little correlation of these emissions with solar activity could be established.
