The thesis delves into a comprehensive examination of Total Electron Content (TEC) data gathered from both GPS and Ionex models in Bahir Dar, Ethiopia, spanning the years 2008 and 2015. This investigation meticulously dissects TEC variations across multiple time scales, including hourly, daily, monthly, seasonal, and solar cycle analyses. Through this scrutiny, noteworthy distinctions emerge between the TEC values derived from the Ionex model and those obtained from GPS readings, shedding light on the dynamic nature of electron density estimations within the ionosphere. Notably, the analysis uncovers day to-day fluctuations in TEC values, underscoring the intricate interplay between the Ionex model and GPS data. Furthermore, the monthly assessments unveil remarkable similarities in TEC distributions between the Ionex and GPS datasets, drawing attention to specific anomalies that manifest during certain months. These fluctuations in TEC values throughout the months reveal subtle discrepancies in peak TEC values, serving as indicators of seasonal variations in ionospheric electron density. These variations are likely influenced by a myriad of factors, including solar activity, geomagnetic disturbances, and atmospheric dynamics. The research underscores the inherent variability in processes impacting TEC estimations, stressing the critical significance of accounting for seasonal variations in ionospheric modeling and predictive endeavors. While the study acknowledges the significant influence of various factors on seasonal variations in Ionex and GPS TEC values, it does not delve into the specific role of neutral wind dynamics in this investigation. During periods of solar minimum and maximum activity, substantial differences in Ionex TEC and GPS TEC values are observed, with notable peaks around 5 and 22 TECU in 2008 and 2015, respectively. These variations are attributed to a diverse array of phenomena, such as solar flares, heightened ionization levels, geomagnetic storms, and technological influences. The study advocates for enhanced TEC evaluations to deepen the understanding of ionospheric dynamics, particularly in light of the intricate interplay of factors affecting TEC values during different phases of solar activity. By conducting more rigorous TEC assessments, researchers can gain a more profound insight into the complex mechanisms at play within the ionosphere, thereby advancing our knowledge of this crucial aspect of Earth's atmosphere.