First Hard X-Ray Imaging Results by Solar Orbiter STIX.

Autor: Massa P; MIDA, Dipartimento di Matematica, Università di Genova, via Dodecaneso 35, 16146 Genova, Italy., Battaglia AF; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland.; ETH Zürich, Rämistrasse 101, 8092 Zürich, Switzerland., Volpara A; MIDA, Dipartimento di Matematica, Università di Genova, via Dodecaneso 35, 16146 Genova, Italy., Collier H; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland.; ETH Zürich, Rämistrasse 101, 8092 Zürich, Switzerland., Hurford GJ; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland., Kuhar M; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland., Perracchione E; Dipartimento di Scienze Matematiche 'Giuseppe Luigi Lagrange', Politecnico di Torino, Torino, Italy., Garbarino S; MIDA, Dipartimento di Matematica, Università di Genova, via Dodecaneso 35, 16146 Genova, Italy., Massone AM; MIDA, Dipartimento di Matematica, Università di Genova, via Dodecaneso 35, 16146 Genova, Italy.; CNR - SPIN Genova, via Dodecaneso 33, 16146 Genova, Italy., Benvenuto F; MIDA, Dipartimento di Matematica, Università di Genova, via Dodecaneso 35, 16146 Genova, Italy., Schuller F; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany., Warmuth A; Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany., Dickson ECM; Institute of Physics, University of Graz, 8010 Graz, Austria., Xiao H; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland., Maloney SA; Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland.; School of Cosmic Physics, Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin, D02 XF86 Ireland., Ryan DF; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland., Piana M; MIDA, Dipartimento di Matematica, Università di Genova, via Dodecaneso 35, 16146 Genova, Italy.; CNR - SPIN Genova, via Dodecaneso 33, 16146 Genova, Italy., Krucker S; University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, 5210 Windisch, Switzerland.; Space Sciences Laboratory, University of California, 7 Gauss Way, 94720 Berkeley, USA.
Jazyk: angličtina
Zdroj: Solar physics [Sol Phys] 2022; Vol. 297 (7), pp. 93. Date of Electronic Publication: 2022 Jul 22.
DOI: 10.1007/s11207-022-02029-x
Abstrakt: The Spectrometer/Telescope for Imaging X-rays (STIX) is one of six remote sensing instruments on-board Solar Orbiter. The telescope applies an indirect imaging technique that uses the measurement of 30 visibilities, i.e., angular Fourier components of the solar flare X-ray source. Hence, the imaging problem for STIX consists of the Fourier inversion of the data measured by the instrument. In this work, we show that the visibility amplitude and phase calibration of 24 out of 30 STIX sub-collimators has reached a satisfactory level for scientific data exploitation and that a set of imaging methods is able to provide the first hard X-ray images of solar flares from Solar Orbiter. Four visibility-based image reconstruction methods and one count-based are applied to calibrated STIX observations of six events with GOES class between C4 and M4 that occurred in May 2021. The resulting reconstructions are compared to those provided by an optimization algorithm used for fitting the amplitudes of STIX visibilities. We show that 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 χ 2 values and the parameters of the reconstructed sources are comparable between methods, thus confirming their robustness.
Competing Interests: Conflict of InterestThe authors declare that they have no conflicts of interest.
(© The Author(s) 2022.)
Databáze: MEDLINE
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