دراسة التغير النسبي للإشعاع الشمسي الكلي في مدينة الموصل

الملخص EN

The research aims to calculate the relative change of the total solar radiation in the city of Mosul by displaying and analyzing mathematical formulas to calculate the total solar radiation falling on the horizontal surface in the city of Mosul, as (12) models were chosen to calculate the total solar radiation, and then calculate the quantities of total solar radiation for an area study through the chosen model, the optimal model or the most suitable model for the study area was determined through the statistical test (standard deviation) for the set of models.

the results showed that the optimal model for calculating the total solar radiation for the Mosul station is model (6), were the slandered degree of the model is (0.014), through the optimal model, the total solar radiation was calculated for the city of Mosul and the relative change in the monthly rates of the quantities of total solar radiation to the city for the period of time between (1987-2019), the research found that the relative change recorded a decrease for all months of the year in the city of Mosul, which was proven by the general trend coefficient, which recorded negative values.

the trend coefficient and the arithmetic mean of the models selected for the study area were extracted based on the excel 2010 program, the total solar radiation was calculated between the three climatic cycles of the city of Mosul, as the quantities of total solar radiation were recorded according to the first climatic cycle (16.4), and the second climatic cycle recorded about (15.9), and the third climatic cycle recorded (15.4) of the quantities of total solar radiation.

the rate of change between the first and second climatic cycles was also amounted to about (-0.5), the rate of change for the same two previous climatic cycles was about (-0.04), and the rate of change between the second and third climatic cycles was (-0.5), and the rate of change was about (-3.140).