CLEAN is a well-established deconvolution approach to Fourier imaging at both radio wavelwengths and hard X-ray energies. However, specifically for hard X-ray imaging, CLEAN suffers two significant drawbacks: a rather limited degree of automation, and a tendency to under-resolution. This paper introduces a multi-scale version of CLEAN specifically tailored to the reconstruction of images from measurements observed by the Spectrometer/Telescope for Imaging X-rays (STIX) on-board Solar Orbiter. Using synthetic STIX data, this study shows that multi-scale CLEAN may represent a reliable solution to the two previously mentioned CLEAN limitations. Further, this paper shows the performances of CLEAN and its multi-scale release in reconstructing experimental real scenarios characterized by complex emission morphologies.
@article{arxiv.2509.07167,
title = {CLEAN and multi-scale CLEAN for STIX in Solar Orbiter},
author = {Miriana Catalano and Anna Volpara and Paolo Massa and Michele Piana and Anna Maria Massone},
journal= {arXiv preprint arXiv:2509.07167},
year = {2025}
}