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Synoptic maps of solar EUV intensities have been constructed for many decadesin order to display the distribution of the different EUV emissions across thesolar surface, with each map representing one Carrington rotation (i.e., onerotation of the Sun). This paper presents a new solar EUV synoptic map datasetbased on full-disk images from Solar and Heliospheric Observatory/ExtremeUltraviolet Imaging Telescope (SOHO/EIT) and Solar DynamicsObservatory/Atmospheric Imaging Assembly (SDO/AIA). In order to remove thesignificant and complicated drift of EIT and AIA EUV intensities due to sensordegradation, we construct the synoptic maps in standardized intensity scale. Wedescribe a method of homogenizing the SOHO/EIT maps with SDO/AIA maps bytransforming the EIT intensity histograms to AIA level. The new maps cover theyears from 1996 to 2018 with 307 SOHO/EIT and 116 SDO/AIA synoptic maps,respectively. These maps provide a systematic and homogenous view of the entiresolar surface in four EUV wavelengths, and are well suited, e.g., for studyinglong-term coronal hole evolution.

New Homogeneous Dataset of Solar EUV synoptic maps from SOHO/EIT and SDO/AIA