This study investigated the temporal variations of solar UV radiation during Solar Cycles 23 (1996-2008) and 24 (2009-2020). The broader implications of the UV irradiance variation for Earth’s atmosphere, climate and biological system were explained. We used the Mg II index as a proxy for solar activity and SOHO UV irradiance data we got the linear model Predicted UV = 0.86 ∗ MgII index + 0.00028 and a strong correlation coefficient R = 0.93. The model demonstrates a high degree of accuracy, as evidenced by a lowroot mean square error (RMSE) of 0.000324. Residual analysis further confirms that prediction errors are minor and randomly distributed, indicating no significant bias in the model’s performance. Time series comparisons between actual SOHO irradiance and the predicted UV irradiance show excellent agreement. From the detailed time series analysis solar Cycle 23 exhibited a pronounced peak in solar UV radiation around 2000-2002, correlating with high sunspot numbers and intense solar activity. In contrast, Solar Cycle 24 showed a weaker and shorter peak around 2014-2015, reflecting lower solar activity. The amplitude of UV irradiance variations was greater in Cycle 23, indicating more significant solar activity compared to Cycle 24. These differences in solar UV radiation are crucial as they directly impact stratospheric ozone production, atmospheric temperature structure, and climate dynamics.