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First hard X-ray imaging results by Solar Orbiter STIX by Massa, Paolo; Battaglia, Andrea F.; Volpara, Anna; Collier, Hannah; Hurford, Gordon J.; Kuhar, Matej; Perracchione, Emma; Garbarino, Sara; Massone, Anna Maria; Benvenuto, Federico; Schuller, Frederic; Warmuth, Alexander; Dickson, Ewan C. M.; Xiao, Hualin; Maloney, Shane A.; Ryan, Daniel F.; Piana, Michele; Krucker, Säm is a scholarly article available to read on EtoBox.

What is First hard X-ray imaging results by Solar Orbiter STIX about?

Context. The Spectrometer/Telescope for Imaging X-rays (STIX) is one of 6 remote sensing instruments on-board Solar Orbiter. It provides hard X-ray imaging spectroscopy of solar flares by sampling the Fourier transform of the incoming flux. Aims. To show that the visibility amplitude and phase calibration of 24 out of 30 STIX sub-collimators is well advanced and that a set of imaging methods is able to provide the first hard X-ray images of the flaring Sun from Solar Orbiter. Methods. We applied four visibility-based image reconstruction methods and a count-based one to calibrated STIX observations. The resulting reconstructions are compared to those provided by an optimization algorithm used for fitting the amplitudes of STIX visibilities. Results. When applied to six flares with GOES class between C4 and M4 which occurred in May 2021, the five imaging methods produce results morphologically consistent with the ones provided by the Atmospheric Imaging Assembly on-board the Solar Dynamic Observatory (SDO/AIA) in UV wavelengths. The $\chi^2$ values and the parameters of the reconstructed sources are comparable between methods, thus confirming their robustness. Conclusions. This pape

Author

Massa, Paolo; Battaglia, Andrea F.; Volpara, Anna; Collier, Hannah; Hurford, Gordon J.; Kuhar, Matej; Perracchione, Emma; Garbarino, Sara; Massone, Anna Maria; Benvenuto, Federico; Schuller, Frederic; Warmuth, Alexander; Dickson, Ewan C. M.; Xiao, Hualin; Maloney, Shane A.; Ryan, Daniel F.; Piana, Michele; Krucker, Säm

Published

2022

Language

EN