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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Long-term Observation of Nighttime Clouds over São João do Cariri (7.4º S, 36.5º W)
Author(s)
Joyrles Fernandes de Moraes, Igo Paulino, Edyvania Emily Pereira Martins, Amauri Fragoso de Medeiros, Ana Roberta Paulino and Ricardo Arlen Buriti
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DOI:10.17265/2162-5298/2017.09.001
Affiliation(s)
Department of Physics, Federal University of Campina Grande (UFCG), Campina Grande 58429-900, Brazil
ABSTRACT
Using images collected by an all sky imager deployed in São João do Cariri (7.4º S, 36.5º W) from September 2000 to
November 2010, the nighttime incidence of clouds has been observed and studied. Most of the nighttime cloudy occurred from February
to July, which is related to the rainy season in the area of the observatory. The
best period to run optical observations over São João do Cariri starts in the early
night up to 22:00 LT (Local Time) throughout the period between
August and December. An anti-correlation between the F10.7
cm solar flux index and the number of cloudy nights was observed, which is an evidence
of the cosmic rays activity in the lower earth’s atmosphere. The location of the all-sky imager provides reliable optical
observations all year through.
KEYWORDS
Cloud, precipitation, solar activity, atmosphere, airglow.
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