The effect of atmospheric screening on the visible border of noctilucent clouds

Details The effect of atmospheric screening on the visible border of noctilucent clouds The effect of atmospheric screening on the visible border of noctilucent clouds

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..363t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, April 1984, p. 363-367, 369-372.

Physics

8

Atmospheric Attenuation, Atmospheric Effects, Cloud Photography, Noctilucent Clouds, Screen Effect, Height, Television Cameras

Scientific paper

Data available from two sites in Scotland have permitted an accurate determination of the effect of atmospheric screening of light by measuring the altitude of the noctilucent cloud (NLC) of the 10th and 11th of July 1979. The effect of atmospheric screening was determined by treating the elevation of the southern boundary of the cloud structures as a function of time. The height of the NLC structures was calculated to be about 82 km. Taking into account the finite angular diameter of the solar disc and the uncertainty in the location of the twilight arch due to its faintness and the refraction of the sun's rays through the atmosphere, a value for the screening height of 7 km was obtained. The screening effect of the atmosphere was therefore confined to the tropospheric cloud. This result differs from the historically accepted value 30 km which was deduced at a time when the dynamic range of the photographic record was much poorer.

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