Results 211 to 220 of about 12,813 (239)

Relationship between sunshine duration and solar radiation

Solar Energy, 2013
Abstract This paper examines the relationship between sunshine duration and solar radiation received on the earth’s surface. Sixty-nine thousand pairs of sunshine–radiation readings from 670 sites were analyzed. A generalization of the Angstrom–Prescott equation of the form K ¯ = K ¯ clear [ β + ( 1 - β ) S γ
Suehrcke, Harry, Bowden, Ross S., Hollands, K.G.T.   +2 more
openaire   +2 more sources

Terrestrial irradiation–sunshine duration clustering and prediction

Energy Conversion and Management, 2003
Abstract The relationship between terrestrial irradiance and sunshine duration is not crisp and there are scatters around a general trend, which most often is expressed to occur in the form of a linear expression. This study presents a way of grouping the solar irradiation–sunshine duration data into convenient seasonal subgroups and then makes ...
Zekai Şen, Ahmet Öztopal
openaire   +1 more source

Estimation of sunshine duration in Saudi Arabia

Journal of Renewable and Sustainable Energy, 2013
In this paper we propose machine learning algorithms to estimate the sunshine duration at any region in Saudi Arabia using easily obtained parameters that include: maximum possible day length (So), extraterrestrial solar radiation at that particular location (Ho), latitude, longitude, altitude, and month number.
Mohamed A. Mohandes, Shafiqur Rehman
openaire   +1 more source

A sunshine monitor for automatic registration of sunshine duration

Archives for Meteorology, Geophysics, and Bioclimatology Series B, 1981
A sunshine monitor and its calibration is described. Its important characteristics are: it has an electrical DC level output which is high (> 4.5 V) for “sunshine” and low (< 0.4 V) for “no sunshine”; it is calibrated for a threshold sensitivity of 200 W/m2, which meets the sunshine definition of the World Meteorological Organization; it requires very ...
openaire   +1 more source

Influence of cloudiness on sunshine duration

International Journal of Climatology, 2011
AbstractThis paper analyzes the influence of cloudiness and cloud genera on sunshine duration based on a very long (1884–2007) homogeneous daily nephological and sunshine duration data series for the City of Krakow. Quadratic regression was used to describe the relationship between sunshine duration and cloudiness.
openaire   +2 more sources

Correlating beam radiation with sunshine duration

Solar Energy, 1992
For seven locations in north and central India, monthly averaged data of daily beam irradiation on a horizontal surface, I, have been correlated with bright sunshine duration, s, using the relation (I/I{sub o}) = b{sub o}(s/S{prime}) where I{sub o} is the monthly mean value of extraterrestrial irradiation over a day, S{prime} is the corresponding ...
openaire   +1 more source

Comparison of sunshine duration measurements from Campbell-Stokes sunshine recorder and CSD1 sensor

Theoretical and Applied Climatology, 2016
Paper presents comparative analysis of sunshine duration measurement results obtained using Campbell-Stokes sunshine recorder (CS) and electronic sensor (CSD1). The comparison is based on data from 2009 to 2010 collected at seven weather stations (Leszno, Wroclaw-Strachowice, Legnica, Opole, Zielona Gora, Jelenia Gora, Klodzko) operated by the ...
Grzegorz Urban, Ireneusz Zając
openaire   +1 more source

Homogenized Sunshine duration data for the Austrian domain

2022
&lt;p&gt;The measurement of sunshine duration has experienced a number of changes since the operational observation by the national meteorological service ZAMG in Austria. With the automatization of the stations the Campbell-Stokes sunshine recorders were replaced by Haenni Solar 111 instruments and later partly with Meteoservice SD6.
Barbara Chimani, Anita Paul, Marc Olefs, Klaus Haslinger, Anna-Maria Tilg   +4 more
openaire   +1 more source

Solar radiation and the duration of sunshine

Quarterly Journal of the Royal Meteorological Society, 1954
AbstractRecords of solar radiation (Q) and of duration of sunshine (n) on a monthly basis have been collected for 32 stations and regression equations relating the data calculated in the form Q = QA (a+bn/N) where QA is the maximum possible radiation in the absence of an atmosphere, and N is the maximum possible duration of bright sunshine. For five of
J. N. Black, C. W. Bonython, J. A. Prescott   +2 more
openaire   +1 more source

Sunshine duration study within the Mediterranean area

Theoretical and Applied Climatology, 1991
The data information of sunshine duration for two different areas on the northern Mediterranean coast are examined. The data concern the same ten years (1968–77) time period, for both areas.
openaire   +1 more source