Inter-comparison of the solar UVB, UVA and global radiation clearness and UV indices for Beer Sheva and Neve Zohar (Dead Sea), Israel

Kudish, A.I.; Lyubansky, Vera; Evseev, Efim G.; Ianetz, A.

doi:10.1016/j.energy.2004.04.033

Cited by 42 publications

(28 citation statements)

References 15 publications

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“…htm). This index has been used subsequently by other authors (Foyo-Moreno et al, 1999Cañada et al, 2000;Ogunjobi and Kim, 2004;Kudish et al, 2005;Retalis et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…It is called the clearness index because it decreases with increasing atmospheric attenuation of solar radiation, mostly determined by cloudiness. The true physical value of the clearness index is instantaneous although it can be used also with hourly values Ogunjobi and Kim, 2004), daily values (Martínez-Lozano et al, 1994a;Kudish and Ianetz, 1996;Ulgen and Hepbasli, 2002;Santos et al, 2003) or monthly values (Udo, 2000;Ulgen and Hepbasli, 2002;Kudish et al, 2005). In order to study the total UV radiation, Martínez-Lozano et al (1994b) defined an ultraviolet clearness index k tUV , with a similar form to k t but referring only to the UV spectral range and using the solar constant for UV radiation, I SCUV (81.13 Wm −2 ) obtained from the SUSIM Atlas 3 extraterrestrial spectrum (http://www.solar.nrl.navy.mil/susim atlas data.…”

Section: Introductionmentioning

confidence: 99%

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The erythemal clearness index for Valencia, Spain

Tena

Martínez‐Lozano

Utrillas

et al. 2008

Intl Journal of Climatology

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ABSTRACT:The values of three clearness indices have been measured for the city of Valencia: k t , the clearness index for the whole solar spectrum, k tUV the clearness index for the ultraviolet range, and the erythemal clearness index for the erythemal radiation k tUVER , corresponding to the solar radiation weighted by the erythemal action spectrum on human skin, normalized with respect to the solar constant corresponding to that spectrum. The measurements of k tUV reached values that were approximately 54% of that corresponding to k t , while those of k tUVER were much smaller. Some statistics of the erythemal clearness index have been calculated both for monthly as well as hourly means. The shape of the distribution in both cases was nearly normal, so standard deviation and variance were used to analyse the dispersion of the data. The ratio of the erythemal clearness index and the corresponding solar irradiance was also studied. When only the central hours of the day were considered the relation between the two was markedly linear, giving a correlation coefficient that reached 99%.

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“…htm). This index has been used subsequently by other authors (Foyo-Moreno et al, 1999Cañada et al, 2000;Ogunjobi and Kim, 2004;Kudish et al, 2005;Retalis et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The erythemal clearness index for Valencia, Spain

Tena

Martínez‐Lozano

Utrillas

et al. 2008

Intl Journal of Climatology

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show abstract

“…The reason for the overestimation is caused by the sensitivity of UV-A for the 501 UVbiometer in the UV-B observation. Kudish et al (2005) reported that the normalized spectral response is ∼0.001 at 330 nm, which is about 10% of the sensitivity at 320 nm. Furthermore, Singh et al (2005) showed that the UV-B biometer actually measures the spectral band of 280-340 nm, by using the broadband filter characteristics.…”

Section: Long-term Validation (Year 2007)mentioning

confidence: 98%

Impact of UV-A radiation on erythemal UV and UV-index estimation over Korea

2015

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Because total UV (TUV) in the UV-A region is 100 times higher than in the UV-B region, UV-A is a considerable component when calculating erythemal UV (EUV) and UV-index. The ratio of EUV to TUV in the UV-A value [EUV(A)/TUV(A)] is investigated to convert the EUV(A) from TUV(A) for broadband observation. The representative value of EUV(A)/TUV(A), from the simulation study, is 6.9 × 10 −4 , changing from 6.1 × 10 −4 to 7.0 × 10 −4 as aerosol optical depth, total ozone and solar zenith angle change. By adopting the observational data of EUV(B) and TUV(A) from UV-biometer measurements at Yonsei University [(37.57 • N, 126.95 • E), 84 m above sea level], the EUV irradiance increases to 15% of EUV(B) due to the consideration of EUV(A) from the data of TUV(A) observation. Compared to the total EUV observed from the Brewer spectrophotometer at the same site, the EUV(B) from the UV-biometer observes only 95% of total EUV, and its underestimation is caused by neglecting the effect of UV-A. However, the sum of EUV(B) and EUV(A) [EUV(A+B)] from two UV-biometers is 10% larger than the EUV from the Brewer spectrophotometer because of the spectral overlap effect in the range 320-340 nm. The correction factor for the overlap effect adjusts 8% of total EUV.

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“…Hourly value of clearness index (K t ) was defined as the ratio of G on a horizontal surface at ground level to its corresponding value outside the Earth's atmosphere (El-Nashar, 1991;Foyo-Moreno et al, 1998;Kudish et al, 2005). Therefore, K t can be expressed as follows:…”

Section: Clearness Index (K T )mentioning

confidence: 99%