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Ozone depletion; airglow emission; excitation mechanism; intensity.

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 O₃ 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 O₃ 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 O₃ concentration.

P K Jana¹ I Saha² S Mukhopadhyay³

1. Department of Chemistry, Government College of Education, Banipur, North-24 Parganas 743 233, India.
2. Department of Chemistry, Metia High School (H.S.), Matia, Basirhat, North-24 Parganas 743 437, India.
3. Department of Chemistry, Jadavpur University, Kolkata 700 032, India.

Published

April 2011

Manuscript received

4 April 2010

Manuscript revised

20 October 2010

Accepted

2 November 2010