We present the spatial and temporal variations of the asymmetric index (AI) of EUV irradiance using SDO/AIA Extreme Ultraviolet (EUV) observations at 19.3 nm wavelength from 2011 to 2021. Cross-correlation (CC) between the AI of EUV irradiance at consecutive latitudes (e.g., 5–15°, 15–25°, etc.) shows that the AI is strongly similar up to the middle latitudes with CC peak appearing at 0 days. However, at higher latitudes, the CC peak appears at a lag of \(\sim \) 29 days. The AI remains largely positive during the ascending phases of solar cycles 24 (2012–2013) and 25 (2020–2021) across all latitudes. AI analysis shows that the EUV emission from the equatorial and polar regions is dominated by the northern hemisphere (NH), whereas the middle latitudinal regions are dominated by the southern hemisphere (SH). For approximately 8 months in the solar maximum, all latitudinal bands of the SH emit more EUV irradiance in comparison to the NH. The hemispheric AI demonstrates a systematic temporal variation. The hemispheric AI reaches a maximum (~ 8%) in year 2012, which becomes negligible after 39 months. After this period, the AI becomes consecutively negative and positive after 24, 27, 19 and 25 months. Hence, hemispheric AI demonstrates a repetition of consecutive dominance of each hemisphere after \(\sim \) 24 months. These variations in EUV irradiance appear to be dependent on the concentration of magnetic field and latitudinal differential rotation. We believe that these findings will be useful in developing a solar magnetic model.
