In this thesis, we analyzed amplitude scintillation index S4 and total electron content (TEC) data of the year 2012 obtained from Global Positioning System-Scintillation Network and Decision (GPS-SCINDA) receiver. We inferred the correlation between amplitude scintillation intensity index S4 and TEC depletion and enhancement from the analyzed data. Our result revealed that the variation in amplitude scintillation intensity index ?4 is negatively correlated with both TEC enhancement and deple­ tion. We have also come across with the seasonal and diurnal dependence of amplitude scintillation index S4 and TEC. The scintillation showed a seasonal variation charac- terized by intense values in March equinox compare to that of in June solstice season. Th~ diurnalvariations of amplitude scintillation intensity index S4 in relation with ~ TEC showed that there is more scintillation and TEC around 15:00 to 20:00 UT and ·th1s is may be due to the enhancement of equatorial spread F and formation of plasma bubble during the night.

A GRADUATE THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF BAHIR DAR UNIVERSITY ,. IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE.._DEGREE OF Advisor :- Tsegaye Kassa (Assistant Professor·& PhD candidate) \, © Copyright by Antneh Gashaye, 2014 ~ • - - MASTER OF SCIENCE IN PHYSICS