3D reconstruction of thermal hard X-ray sources in solar flares from combined STIX and HXI visibilities
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Dateien
Autor:in (Körperschaft)
Publikationsdatum
2026
Typ der Arbeit
Studiengang
Sammlung
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Astronomy & Astrophysics
Themenheft
DOI der Originalpublikation
Link
Zugehörige Forschungsdaten
Reihe / Serie
Reihennummer
Jahrgang / Band
710
Ausgabe / Nummer
Seiten / Dauer
A105
Patentnummer
Verlag / Herausgebende Institution
EDP Sciences
Verlagsort / Veranstaltungsort
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Context. The Spectrometer/Telescope for Imaging X-rays (STIX) on board the ESA Solar Orbiter mission and the Hard X-ray Imager (HXI) aboard the Advanced Space-based Solar Observatory (ASO-S) satellite provide for the first time systematic coverage of solar flare hard X-ray sources from different vantage points. This unprecedented configuration enables the reconstruction of the three-dimensional (3D) hard X-ray intensity distribution of the thermal emission in solar flares.
Aims. The main objectives of this study are twofold: (1) to perform 3D reconstructions of the thermal hard X-ray source of a solar flare using stereoscopic Fourier data (visibilities) provided by STIX and HXI; and (2) to investigate the evolution in time of the reconstructed 3D source morphology.
Methods. The sets of 2D visibilities measured by STIX and HXI represent a sampling of the 3D Fourier transform of the flaring hard X-ray source on two planes orthogonal to the instruments’ lines of sight. Therefore, the 3D reconstruction problem is analogous to the standard 2D imaging problem and can be addressed with similar techniques. In this case, we performed 3D reconstructions by means of the iterative space reconstruction algorithm (ISRA).
Results. We consider the SOL2024-10-03T12:12 event observed by STIX and HXI from largely different vantage points separated by 85.7°. We performed 3D reconstructions of the flaring thermal emission at a 10 s cadence, and we determined the X-ray source height and radial velocity over time. As a consistency test, we show that the morphology and location of our 3D reconstructions are consistent with the corresponding 2D images independently obtained from STIX and HXI data.
Conclusions. The proposed 3D reconstruction methodology provides reliable results for events with a separation angle close to 90°. However, the dynamic range of the 3D reconstructions is limited by the low number of observed visibilities (as in the 2D case) and by the limited number of vantage points on the flaring events.
Schlagwörter
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
1432-0746
0004-6361
0004-6361
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
peer-reviewed
Open Access-Status
Gold
Lizenz
Zitation
Palumbo, B., Massa, P., Stiefel, M., Ryan, D. F., Collier, H., Su, Y., Piana, M., & Krucker, S. (2026). 3D reconstruction of thermal hard X-ray sources in solar flares from combined STIX and HXI visibilities. Astronomy & Astrophysics, 710, A105. https://doi.org/10.1051/0004-6361/202558675