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Changes in Irradiance and Illuminance on Earth Surface during 11-Year Solar Activity Cycle L&E 28 (2) 2020

Light & Engineering 28 (2)

Volume 28
Date of publication 04/13/2020
Pages 61–66

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Changes in Irradiance and Illuminance on Earth Surface during 11-Year Solar Activity Cycle L&E 28 (2) 2020
Articles authors:
Alexander V. Leonidov

Alexander V. Leonidov, Ph.D. in Technical Science, graduated from MPEI in 1970 by speciality light and engineering and sources of light. Currently, he is a retired freelance researcher

Abstract:
The article formulates the analytic expression approximating the sequence of Gregorian 11-year solar cycles and the expression of solar activity within one cycle. The dependences of effective thermodynamic temperature of the Sun photosphere and the solar constant, and the solar illuminance constant at the upper border of Earth atmosphere on the year number within one solar cycle were obtained. The generalised analytic expression for integral transmittance of atmosphere (within its spectral window) on the Earth surface for the direct and diffuse components of solar radiation and their sums at different solar altitude angles is presented. The analytic expressions of dependences of irradiance and illuminance on the Earth surface within spectral window of atmosphere and within the visible region of solar radiation spectrum on the year number within a certain solar cycle at different solar altitude angles are obtained. The results of calculation of direct and diffuse components of irradiance and illuminance and their sums in the case of clear sky are presented for example. The proposed approach allows similar calculations to conduct for different types of sky cover.
References:
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