000008144 001__ 8144
000008144 005__ 20260722102846.0
000008144 0247_ $$2DOI$$a10.3847/2041-8213/ae7d2e
000008144 037__ $$aSCART-2026-0146
000008144 100__ $$aGuastavino, Sabrina
000008144 245__ $$aValidation of an Extreme-ultraviolet Desaturation Technique for the Atmospheric Imaging Assembly on Board the Solar Dynamics Observatory Using Observations from the Extreme Ultraviolet Imager on Board Solar Orbiter
000008144 260__ $$c2026
000008144 520__ $$aHigh-dynamic-range imaging in the extreme-ultraviolet regime is frequently compromised by detector saturation and charge blooming during intense solar flares, preventing reliable photometry of flare cores. This study presents, for the first time, a direct validation of a sparsity-regularized inverse-diffraction desaturation algorithm applied to saturated images from the Atmospheric Imaging Assembly on the Solar Dynamics Observatory, using contemporaneous short-exposure, unsaturated observations from the Extreme Ultraviolet Imager on Solar Orbiter. The validation exploits a near-radial spacecraft alignment on 2024 March 19, when an M2.1 flare erupted in active region 13615. To obtain coregistered intensity maps, the data were processed with reprojection onto a common helioprojective grid, exposure-time normalization, light-travel-time correction, and field-of-view pointing refinement. Photometric comparisons were performed using peak-based statistics within a rigorously defined region of interest. Results show close morphological agreement and a temporally stable ratio between the desaturated and reference intensities through the impulsive and early decay phases. An early-phase discrepancy is observed and attributed to rapid subexposure evolution, sampling effects, and bandpass/response differences. These findings demonstrate that the desaturation procedure successfully recovers physically meaningful time-dependent core fluxes and, for the first time, provide independent empirical support for the use of desaturated archive frames in quantitative studies of large flares.
000008144 594__ $$aSTCE
000008144 6531_ $$aSolar Orbiter
000008144 6531_ $$aEUI
000008144 6531_ $$aflares
000008144 700__ $$aBerghmans, David 
000008144 700__ $$aVerbeeck, Cis
000008144 700__ $$aHofmeister, Stefan
000008144 700__ $$aKraaikamp, Emil
000008144 700__ $$aDickson, Ewan C. M. 
000008144 700__ $$aBenvenuto, Federico
000008144 700__ $$aMassa, Paolo
000008144 700__ $$aMassone, Anna Maria
000008144 700__ $$aPiana, Michele
000008144 773__ $$cid.L50$$n2$$pThe Astrophysical Journal Letters$$v1005$$y2026
000008144 8560_ $$fdavid.berghmans@ksb-orb.be
000008144 85642 $$ahttps://ui.adsabs.harvard.edu/abs/2026ApJ..1005L..50G/abstract
000008144 85642 $$ahttps://iopscience.iop.org/article/10.3847/2041-8213/ae7d2e
000008144 905__ $$apublished in
000008144 980__ $$aREFERD