Equatorial ionospheric (e.g. equatorial electro-jet, EEJ) irregularity is a nuisance for technologies that depend on trans-ionospheric propagating radio waves. Significant efforts are being carried out to understand the EEJ irregularity; however, the African equatorial ionosphere that shows unique phenomena as observed by Low Earth Orbiting (LEO) satellite is the least investigated due to the lack of ionospheric monitoring instruments. In this thesis the spatial, temporal and statistical characteristics of equatorial electro-jet (EEJ) irregularities over Bahir Dar region are investigated using data from ground based Very High Frequency (VHF) Coherent Backscatter Radar, which is installed recently at Bahir Dar, Ethiopia and it is the first kind in Africa. One year data have been used and Doppler power spectral and statistical techniques have been applied to investigate the characteristics of the EEJ irregularity. It is found out that the EEJ irregularities were occurred, most frequently, between 99 and 102 km above sea-label within the time intervals of 10 to 14 LT (local time). Also, intense EEJ irregularities have been observed more frequently in the March equinox than other seasons. Moreover, the returned echoes of irregularities were found to have power spectra with peak power centered at zero or nearly zero Doppler shift. This indicates that the most dominant class of EEJ irregularity is type II. Some power spectra with mixture of type I and Type II were also observed in the returned echoes of the irregularities