Long-term ozone decline and its effect on night airglow intensity of Li 6708 Å at Varanasi (25°N, 83°E) and Halley Bay (76°S, 27°W)

Abstract

A critical analysis has been made on the long-term yearly and seasonal variations of ozone concentration at Varanasi (25°N, 83°E), India and Halley Bay (76°S, 27°W), a British Antarctic Service Station. The effect of O 3 depletion on night airglow emission of Li 6708 A line at Varanasi and Halley Bay has been studied. Calculations based on chemical kinetics show that the airglow intensity of Li 6708 A line has also been affected due to the depletion of O 3 concentration. The yearly variations and seasonal variations of intensities of Li 6708 A line for the above two stations are shown and compared. It has been shown that the rate of decrease of intensity of Li 6708 A line was comparatively more at Halley Bay due to dramatic decrease of Antarctic O 3 concentration.