Decrease in the Clear Air Transmission at Helwan Observatory Site

Details Decrease in the Clear Air Transmission at Helwan Observatory Site Decrease in the Clear Air Transmission at Helwan Observatory Site

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995em%26p...70..143m&link_type=abstract

Earth, Moon and Planets, v. 70, UN/ESA Workshops Vol. 5, p. 143-149.

Computer Science

Scientific paper

Clear air atmospheric transparency of eight nights at Helwan Observatory site during autumn period of 1987 have been determined using the yellow filter GG5. The prevailing atmospheric transmission extends to 58%. A comparison with previous values obtained with the same filter and site during autumn period of 1963 shows a considerable decrease at the present years in the clear air transmission of the site of Helwan. This can be attributed to the aerosol pollution of the site caused mainly by the increase of the industrial centers at Helwan Zone. Clear air atmospheric transparency values at the beginning of winter season and at spring season are also given.

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