Recognising and photographing noctilucent clouds

Details Recognising and photographing noctilucent clouds Recognising and photographing noctilucent clouds

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987wthr...42..180m&link_type=abstract

Weather (ISSN 0043-1656), vol. 42, June 1987, p. 180-184.

Physics

Cloud Photographs, Noctilucent Clouds, Auroras, England, Ice, Meteorites, Troposphere

Scientific paper

Noctilucent clouds (NLCs) lie at the mesosphere-thermosphere boundary more than 80 km high, at the coldest part of the atmosphere, and are primarily observable between 50 and 65 deg N and S latitudes. Their great height and high reflectivity make them visible during twilight during the summer months, as the sun's rays continue to illuminate them after the much lower tropospheric clouds have ceased to receive direct sunlight. Attention is presently given to techniques for NLC recognition and photography with 35-mm single-lens reflex cameras, using either standard lenses of 50-mm focal length or 28-35-mm wide-angle lenses. A tripod is essential for steadying the camera.

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