Solar energy distribution over Egypt using cloudiness from Meteosat photos

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Solar Energy (Journal of Solar Energy Science and Engineering); (USA)

DOI:https://doi.org/10.1016/0038-092X(90)90155-6· OSTI ID:5685144

Mosalam Shaltout, M A; Hassen, A H ^[1]

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1. National Research Institute of Astronomy and Geophysics, Cairo (Egypt)

In Egypt, there are 10 ground stations for measuring the global solar radiation, and five stations for measuring the diffuse solar radiation. Every day at noon, the Meteorological Authority in Cairo receives three photographs of cloudiness over Egypt from the Meteosat satellite, one in the visible, and two in the infra-red bands (10.5-12.5 {mu}m) and (5.7-7.1 {mu}m). The monthly average cloudiness for 24 sites over Egypt are measured and calculated from Meteosat observations during the period 1985-1986. Correlation analysis between the cloudiness observed by Meteosat and global solar radiation measured from the ground stations is carried out. It is found that, the correlation coefficients are about 0.90 for the simple linear regression, and increase for the second and third degree regressions. Also, the correlation coefficients for the cloudiness with the diffuse solar radiation are about 0.80 for the simple linear regression, and increase for the second and third degree regression. Models and empirical relations for estimating the global and diffuse solar radiation from Meteosat cloudiness data over Egypt are deduced and tested. Seasonal maps for the global and diffuse radiation over Egypt are carried out.

• OSTI ID: 5685144
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (USA), Vol. 45:6; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
EGYPTIAN ARAB REPUBLIC
INSOLATION
CLIMATES
CLOUD COVER
CORRELATIONS
DATA
DIFFUSE SOLAR RADIATION
DISTRIBUTION
IMAGES
INFRARED RADIATION
MAPS
MATHEMATICAL MODELS
METEOROLOGY
MONTHLY VARIATIONS
REGRESSION ANALYSIS
REMOTE SENSING
SATELLITES
VISIBLE RADIATION
WATER VAPOR
AFRICA
DEVELOPING COUNTRIES
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
INFORMATION
MATHEMATICS
RADIATIONS
SOLAR FLUX
SOLAR RADIATION
STATISTICS
STELLAR RADIATION
VAPORS
VARIATIONS
140100* - Solar Energy- Resources & Availability