The Spectrometer/Telescope for Imaging X-rays (STIX) is the instrument on-board the ESA Solar Orbiter mission designed for the observation of solar flares’ X-ray radiation in the energy range 4-150 keV. STIX contains 30 units, called sub-collimators, consisting of a pair of tungsten grids mounted in front of a Cadmium Telluride (CdTe) detector. The X-ray radiation incident on the telescope is transmitted through the grid pair and creates a Moiré pattern on the pixelated detector. The pattern position and intensity is related to amplitude and phase of a 2-dimensional Fourier component of the flaring X-ray sources, named visibility. Therefore, from the measurements of the STIX detector pixels it is possible to retrieve 30 complex visibility values, which can be used for reconstruction of images of the flaring X-ray sources.
In this talk, we will describe the indirect imaging technique applied by STIX and we will provide a brief overview of the implemented imaging methods. Further, we will show how to perform regularized imaging-spectroscopy of the flaring sources. Finally, we will describe applications of AI techniques for both image reconstruction and flare localization using STIX data.
Local contact: Olivier LIMOUSIN
Organisation: Pierre-Antoine FRUGIER
DAp