Authors: Gabriela Gonzalez (CU/LASP), Phillip Chamberlin (LASP)

Using the “A” channel from the Multiple EUV Grating Spectrographs (MEGS-A) on EVE, which measures wavelengths of 5-37 nm, we improve the wavelength scale accuracy and spectral resolution during solar flares. EVE’s least processed data product, Level 0B, is used to create updated wavelength scales that are shown to make more precise spectral measurements (Gonzalez et al. 2024). Before Doppler calculations can be made, additional corrections must be done to account for the detector degradation. We found an average uncertainty of 1.33×10−4 nm for MEGS-A2 using a late gradual phase time compared to the other SDO/EVE data products. This translates to a Doppler velocity uncertainty of 2.08 km/s and 1.11 km/s for shorter and longer wavelengths.