GRADUATE PROJECT WORK ON RESPONSE OF ETHIOPIAN IONOSPHERE TO SOLAR ACTIVITY

Amensisa, Negasa

dc.contributor.author	Amensisa, Negasa
dc.date.accessioned	2017-08-04T04:12:18Z
dc.date.available	2017-08-04T04:12:18Z
dc.date.issued	2017-08-04
dc.identifier.uri	http://hdl.handle.net/123456789/7575
dc.description	A PROJECT SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF BAHIR DAR UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN PHYSICS	en_US
dc.description.abstract	he data collected by the ground based GPS receiver located at Adama (8.57° Nand 39.29° E) have been analyzed to study the temporal variations of the ionosphere in ) the region. We have also investigated the effects of sunspot and geomagnetic storm on the characteristics of the total electron content (TEC) values. We have found that the TEC values are minimum at pre-down through out the year, followed by a steep increase in its value in the intervals lOOOUT-1400UT. This is due to the variation of the strength of solar radiation that reaches the atmosphere. We have observed larger TEC values in autumn and spring seasons, and the minimum and the intermediate TEC values in summer and winter seasons respectively. Because during the autumn and spring the Sun is overhead at Adama station the intensity of radiation that comes from the Sun is maximum. But during summer and winter the Sun is not overhead at Adama and this means minimum Sun's radiation reach to the atmosphere. The TEC values increase when the sunspot number is increase. The observed TEC values are correlated with sunspot numbers. This is due to the fact that when there are more radiation(X-ray and UV) from the Sun during large number of sunspots. The effects of the geomagnetic storm on TEC values have been found negative and positive 1 correlation with geomagnetic storm.	en_US
dc.subject	PHYSICS	en_US
dc.title	GRADUATE PROJECT WORK ON RESPONSE OF ETHIOPIAN IONOSPHERE TO SOLAR ACTIVITY	en_US
dc.type	Thesis	en_US