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    STUDIA AMBIENTUM - Issue no. 1-2 / 2009  
         
  Article:   THE RELATIONSHIP BETWEEN SOLAR ACTIVITY AND THE ANNUAL PRECIPITATION IN THE CLUJ-NAPOCA AREA, ROMANIA.

Authors:  DUMITRU RISTOIU, SANDU-VALER TAHÂȘ. 		 
       
         
  Abstract:  Solar radiation is the driving force for the hydrological cycle. However, there are an insufficient number of measurements of solar radiation for many practical problems. In this paper, we examine the relationship between solar activity and the annual precipitation in the Cluj-Napoca area. The results indicate that annual rainfall is closely related to the variation of number of sunspots and less of variation of global solar radiation, and that solar activity probably plays an important role in influencing the precipitation on land. To estimate the global solar radiation from sunshine hours, it is used the Angstrom-Prescott equation. Also, the proposed research here describes the fact that a solar beam can penetrate the atmosphere more easily when there is no rain and it is attenuated when precipitation intensity is higher.

Keywords: Sunspot numbers; global solar radiation; precipitation; Angström–Prescott equation; t-test statistics; correlation 		 
         
     
         
         
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