Abstract
The climatic changes associated with solar variability are largely caused by variations in total solar irradiance and solar spectral irradiance with solar activity. Thus the spectral composition of solar radiation is crucial in determining atomspheric structure. The variations in solar spectrum depend on the varied solar spots. Recently, evidence for a strong effect of solar activity on terrestrial isolation on ground-based measurements carried out by the National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt (lat. 29?52'N and long. 31?20'E) during (1990-2000) were presented. Specifically, a strong increase of terrestrial isolation with sunspot number as well as a decline of the solar spectrum with solar activity was reported. Daily measurements of the solar radiation between 280 nm and 2800 nm were made by Eppley Pyranometer and Pyrheliometer instruments. The decreasing at the range 280 - 530 nm and 530 - 630 nm are represented less than 50% of direct solar radiation and the stability of at the range 630 - 695 nm and 695 - 2800 nm it mean that; some of difference radiation is appear in diffused radiation which allow to height of the temperature as much as the largest associated with significance as it appears from the curves of relative humidity.
Highlights
There have been many arguments as to whether or not the eleven-year sunspot cycle affects our weather and climate
The climatic changes associated with solar variability are largely caused by variations in total solar irradiance and solar spectral irradiance with solar activity
The decreasing at the range 280 - 530 nm and 530 630 nm are represented less than 50% of direct solar radiation and the stability of at the range 630 - 695 nm and 695 2800 nm it mean that; some of difference radiation is appear in diffused radiation which allow to height of the temperature as much as the largest associated with significance as it appears from the curves of relative humidity
Summary
There have been many arguments as to whether or not the eleven-year sunspot cycle affects our weather and climate. There is a broad consensus that there is a small, but discernible influence of solar variability on the climate on decadal and longer time scales [3] The effect of these changes on temperature noted by some researchers [4], comes in coincidence with the change in solar irradiance. (1990-2000), but the total solar irradiance measurement indicates similar radiative output as during the rise of cycle 22. This observation brings up the question of whether the solar radiative variability is affected by factors other than sunspots, faculae and enhance network. Ambient air temperature (T inC), relative humidity (R.H in %), wind speed (WS in m·s−1) and wind direction (WD in degree) are listed in Table 2, as these parameters are the most relevant for interpretation of the results
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