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Preprint Sep 2026

Count-based spectral component imaging (CCI) of solar flares in X-rays

X-ray emission in solar flares is produced by both multi-thermal plasma and accelerated electrons. Classical imaging approaches reconstruct X-ray intensity maps which contain contributions from multiple spectral components (e.g., hot, superhot, and non-thermal), and do not allow retrieving the morphology of the differe...

A. Guidetti, M. Stiefel, P. Massa et al. · 0 citations
Open access Sep 2026

In-Flight Self-Calibration of the STIX Grid Transmission

The Spectrometer/Telescope for Imaging X-rays (STIX) on board Solar Orbiter provides imaging information on the X-ray sources in solar flares by modulating the emitted radiation with pairs of grids made of stacked tungsten layers. Optical measurements of the grids were taken on the ground and utilized to derive an init...

P. Massa, A. Volpara, M. Stiefel et al. · 0 citations

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