اسم المؤلف:
محمد كريم عبد الرضا
اسم المشرف:
ضياء صائب احمد الالوسي
المستخلص:
This study embedded the dust phenomenas and how do they effect on the magnitude of sun ray in Iraq and this study has divided those phenomenas into three categories which are : dust storm , suspended dust , elevated dust , in addition of understanding of each separate phenomena , this study has also categorized the sources of the dust into two categories ; the first which is the natural resources that forms the greater ratio of dust and that is (90%) , the second is the human resources which forms (10%) of the dust resources .The study also embedded the affective factors that form the dust phenomenas which contains the natural factors (heat temperature , rain falls , winds , relative humidity) and how these factors effect on the dust phenomenas besides that of the human factors such as (greedy shepred , unplanned civilized expansion) .Which as roll in dust forming , also this study has unveiled the difference between sand storms and dust storms . The study referred to the color of these storms and their dependent on the source of dust or sand whether the color was of dust color (red , black , orange , brown) and that the dust storm interval is divided into three phases before it happens or before it forms (the phase of elevating the soil from the surface of the earth , the phase of transferring into the atmosphere which is depend ant on the velocity of the winds , besides of the sedimentary phase which can be generated by the influence of rain falls water or by the earth gravity or by turbulence in climate situation) .There are two forms of the dust storms ; the first is : the longitude needle end which featured by wide shape less than (150) km ; the second is : so wide and more than (200) km . The study has categorized the dust storms that precipitate on Iraq into three categories (summer storms , winter dust storms which are rare , spring dust storm) , and that the regions and zones of these storms in Iraq are domestic , and regional . The study unveiled that the dust storms increase during summer time , and also during spring season , and as long as we move towards the south of Iraq , and that the topic station among all study covered stations and for repeatedly the dust and elevated dust storms is “Nasiriya” station and the less one was “Kirkuk” station , whilst “Mosul” station was the highest repetition of the suspended dust , and that “Rutba” station was the lowest one . The study also mentioned to the principals of the sun ray and its components as for the wave length , which is well known that the sun ray composes of “ultra violet ray” which forms (8%) of the total sun energy and the visible ray forms (41%) , and the “infrared” ray forms (51%) of the total energy . The study viewed that the sun ray is divided into tow components while hitting or incident on the surface of the earth and these are : the direct ray , and the indirect ray and that the sun ray is objected to processes of absorption , reflection and dispersion , while the factors that affect the magnitude of the sun may are the angle of ray incident , and the distance between earth and sun , the time limit of illumination , climate transparency , terranes , and Albedo . The researcher at the end of this study made clear of influence of the dust phenomenas on the magnitude of the sun ray by plotting and using Pearson junction equation and by means of (spss) program , he found out that the annual relationshipbetween dust storms and sun ray is reversal and meaning in “Kirkuk” and “Nasiriya” stations and that the relationship between the suspended and elevated dust with the sun ray is reversal meaningful in the “Kirkuk” , “Basra” station , whilst the monthly relationship between dust phenomenas and the sun ray is strongly proportional at the most of the referred station .
