Forward fitting STIX visibilities

Aima. To determine to what extent the problem of forward fitting visibilities measured by Spectrometer/Telescope Imaging X-rays (STIX) on-board Solar Orbiter is more challenging with respect same in case previous hard X-ray solar imaging missions; identify an effective optimization scheme for parametric STIX. Methods. This paper introduces a Particle Swarm Optimization (PSO) algorithm STIX and compares its effectiveness standard simplex-based used so far analysis Reuven Ramaty High Energy Spectroscopic Imager (RHESSI). comparison made considering experimental both RHESSI STIX, synthetic generated accounting signal formation model. Results. We found out that approach based on PSO as reliable one simplex method visibilities. However, significantly robust when applied simulated Conclusions. Standard deterministic not enough forward-fitting few sampled angular frequency plane. Therefore sofisticated must be introduced telescope. The routine we this proved reliable, could considered candidate tool context.