Assessment of spectra of solar radiation during the partial solar eclipse of 21 June 2020 at, Tanta, Egypt

Abstract

The main objective of this study is to obtain vartiation of solar spectrum during the recent solar eclipse in the range 350-1100nm. The net results are studying the spectral composition of global solar radiation which are collective of the direct and diffuse solar radiation values do not similar to the computation result (45% covering of the solar disk). The maximum absorption energy in the atmosphere is at range 820-900nm. The depression in the solar enenrgy is 0.11 (W.m -2 .nm -1 ). The ultraviolet band is suffering low depression with respect to another bands but not given any risks on the human life as common. That the change in meteorological parameter related to variability in the solar spectrum that shift the short wave before 600 nmto long wave around 1000 nm. The most extreme drop in the solar spectrum lies in the interval which consists of the normal peak of the solar spectrum from 500 -600nm. The percentage of radiant energy reaching the earth through 350-1100nm at the maximum of the solar eclipse was 54%. Consequently, the rate of depresion in energy is equal to 46%, which is very strange compared to the normal flow rate of 44%. During the eclipse, the maximum solar energy at the maximum eclipse are at 480nm (13.07 W.m -2 .nm -1 ) and 630nm (13.17 W.m -2 .nm -1 ). At the wavelength 580nm rpresents the absorbition of O 2 , andthe absorbtion of H 2 O at 680, 730, 780 and the maximum absorbtion energy by the H 2 O is at 830nm (low enegy transimmted at 0.31 W.m -2 .nm -1 ).