Validation 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

High-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.

Schlagwörter

Fachgebiet (DDC)

520 - Astronomie, Kartografie

Projekt

Veranstaltung

Startdatum der Ausstellung

Enddatum der Ausstellung

Startdatum der Konferenz

Enddatum der Konferenz

Datum der letzten Prüfung

ISBN

ISSN

2041-8213
2041-8205

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Ja

Zukunftsfelder FHNW

Publikationsstatus

Veröffentlicht

Begutachtung

peer-reviewed

Open Access-Status

Gold

Lizenz

Zitation

Guastavino, S., Berghmans, D., Verbeeck, C., Hofmeister, S. J., Kraaikamp, E., Dickson, E. C. M., Benvenuto, F., Massa, P., Massone, A. M., & Piana, M. (2026). Validation 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. The Astrophysical Journal. Letters, 1005(2), L50. https://doi.org/10.3847/2041-8213/ae7d2e

Komplettanzeige