Measurements of the air pollution effects on the color portions of solar radiation at Helwan, Egypt

Shaltout, Mosalam; Ghonim, M.M.; Hassan, A.H.

doi:10.1016/0960-1481(96)88510-7

Cited by 4 publications

(5 citation statements)

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“…However, the C-P in the direct infrared IB 4 during the eclipse is low, while the high values are very near to sunrise and sunset, where there are high air masses, which are the major causation of the absorption and scattering of the infrared wavelengths. Generally, the results for the color portion agree with previous work in this location [8]. Table 3 presents the hourly variation of the optical depth (α) and transparency (τ ) from 0800 to 1600 through the duration of the eclipse of the global (G), global infrared (G IR ), global ultraviolet (G UV ), total direct (I) as well as direct color bands IB 1 , IB 2 , IB 3 and IB 4 .…”

Section: Theoretical Backgroundsupporting

confidence: 85%

“…This means that the intensity of the scattering of UV light is eleven times the scattering of red light. This region is characterized by the high pollutant limit and the large size of the pollutants (mainly Ca and Fe) [8,14]. Secondly, the ozonosphere absorbs a large amount of this band.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The maximum drop in the solar spectrum lies in the interval that consists of the normal peak of the solar spectrum from 500-600 nm. An investigation was made of the effects of pollutants on the color portion, where the increase in pollutants reduces the violet-blue band by 11 %, the green-yellow band by 14 %, the red band by 13 % and the infrared band by 5 % of the average annual values [8].…”

Section: Introductionmentioning

confidence: 99%

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Color Portion of Solar Radiation in the Partial Annular Solar Eclipse, October 3rd, 2005, at Helwan, Egypt

Hassan¹,

Rahoma²,

Sabry³

et al. 2010

Acta Polytech

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Measurements were made of various solar radiation components, global, direct and diffuse and their fractions during the partial annular solar eclipse on October 3rd, 2005 at Helwan, Egypt (Lat. 29.866◦ N and Long. 31.20◦ E), and an analysis has been made. The duration of the solar eclipse was 3 h 17 min, and the maximum magnitude of the eclipse in this region was 0.65. The optical depth of the direct component and the relative humidity decreased, while both the transparency and the air temperature increased towards the maximum eclipse. The general trends of the global components are decreasing optical depth and increasing transparency between the first contact and the last contact. The prevailing color during the eclipse duration was diffused infrared (77 % of the total diffuse radiation level).

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Section: Theoretical Backgroundsupporting

confidence: 85%

Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Color Portion of Solar Radiation in the Partial Annular Solar Eclipse, October 3rd, 2005, at Helwan, Egypt

Hassan¹,

Rahoma²,

Sabry³

et al. 2010

Acta Polytech

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“…. m (4) has generally been used for calculating Linke's turbidity factor in most recent work. In 1986, a determination of d R based on more accurate values of spectral extraterrestrial solar irradiance and extinction coefficients of the various attenuators was carried out by Louche, [14], who proposed the following algorithm to evaluate the optical thickness of the clean dry atmosphere from the relative air mass:…”

Section: The Linke Approachmentioning

confidence: 99%

“…The question of the existence and tracer power of regional elemental characteristics reflecting the structure of emission sources at a given location has been treated in a number of publications. As summarized in some reference papers [3,4,5], single element tracers or ratios of elemental concentrations can be used for studying the nature of major emission sources in the region as well as for pinpointing the source areas of aerosols transported to the site of observation.…”

Section: Introductionmentioning

confidence: 99%

Comparison Between Atmospheric Turbidity Coefficients of Desert and Temperate Climates

Elminir¹,

Rahuma²,

Benda³

2001

Acta Polytech

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Knowledge of the solar radiation available on the earth’s surface is essential for the development of solar energy devices and for estimating of their performance efficiencies. For this purpose it is helpful to study the attenuation of direct normal irradiance by the atmosphere, in terms of fundamental quantities, including optical thickness, relative optical air mass, water vapor content, and aerosol amount. In the present article, we will not deal with cloudy atmospheres because of their great variability in space and time, but will focus our attention on atmospheres characterized by the complete absence of condensed water. The objectives of this article are to report data on aerosol optical depth and atmospheric turbidity coefficients for a desert climate, and to compare them with those of a temperate climate. Aerosol optical depth, the Linke turbidity factor, TL, and ngström turbidity coefficients, _, are calculated from measurements of broadband filters at Helwan, Egypt, which has a desert climate. A linear regression model is to be determined between the Linke factor and the ngström turbidity coefficient. This relation is compared with similar relations reported for a temperate climate [Prague, Czech Republic]. This comparison is made to determine whether a universal relation exists between these two important coefficients, or whether the relation is location dependent.

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A comprehensive review of the impact of dust on the use of solar energy: History, investigations, results, literature, and mitigation approaches

Sarver¹,

Al-Qaraghuli²,

Kazmerski³

2013

Renewable and Sustainable Energy Reviews

784

371

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Measurements of the air pollution effects on the color portions of solar radiation at Helwan, Egypt

Cited by 4 publications

References 0 publications

Color Portion of Solar Radiation in the Partial Annular Solar Eclipse, October 3rd, 2005, at Helwan, Egypt

Color Portion of Solar Radiation in the Partial Annular Solar Eclipse, October 3rd, 2005, at Helwan, Egypt

Comparison Between Atmospheric Turbidity Coefficients of Desert and Temperate Climates

A comprehensive review of the impact of dust on the use of solar energy: History, investigations, results, literature, and mitigation approaches

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