TRAVELING  IONOSPHERIC  DISTURBANCE (TIDs)  CHARACTERISTICS  ESTIMATION FROM GPS-TEC  OVER ETHIOPIAN LONGITUDINAL SECTOR

SELMAN, SHUMIYE

dc.contributor.author	SELMAN, SHUMIYE
dc.date.accessioned	2018-11-09T09:34:25Z
dc.date.available	2018-11-09T09:34:25Z
dc.date.issued	2018-11-09
dc.identifier.uri	http://hdl.handle.net/123456789/9142
dc.description.abstract	Abstract The focus of this thesis is to determine TIDs characteristics over Ethiopian longitudinal sector using a GPS-TEC data on July, 2013.because of few researchers have been tried to study TIDs characteristics in the Ethiopian longitudinal sector. We are motivated to study the characteristics of TIDs over Ethiopian longitudinal sector by using the ground-based GPS receivers. Calibrated data has been imported into MATLAB code and gave us the result of the value of TEC for each hour, its impact on the GPS(Global Positioning System) signals, both amplitude, and phase, often results in a degraded performance of the GPS receivers. Based on observational data obtained from dual-frequency GPS receivers at two triangular observational networks in three station Bahir dar (11.6 N; 37.35 ◦ E), Seraba (12.061 o N; 37.022 o E) and Debarek (12.021 o E), ionospheric variability of three quiet days on July 2013 is studied using cross-correlation method and TEC measurements. On this day around 17–19.5 LT, a TID was observed from both data sets simultaneously. The TID had a period length of around 2.5 h, and its wave propagated northward with a horizontal phase velocity have been determined in the range of 145–435 m/ s. Keywords.Traveling ionospheric disturbance (TID), Atmospheric gravity wave(AGWs)	en_US
dc.language.iso	en_US	en_US
dc.subject	Physics	en_US
dc.title	TRAVELING IONOSPHERIC DISTURBANCE (TIDs) CHARACTERISTICS ESTIMATION FROM GPS-TEC OVER ETHIOPIAN LONGITUDINAL SECTOR	en_US
dc.type	Thesis	en_US