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Triangulation of Hard X-Ray Sources in an X-Class Solar Flare with ASO-S/HXI and Solar Orbiter/STIX
Daniel F Ryan1,2, Paolo Massa1, Andrea F Battaglia1,3,4
1University of Applied Sciences and Arts Northwestern Switzerland, Bahnhofstrasse 6, Windisch, 5210 Switzerland.
Solar Physics
|August 26, 2024
Summary
First-ever multi-viewpoint solar hard X-ray imaging reveals the 3D geometry of solar flares. This new capability precisely maps flare structures, showing more elongated magnetic loops than previously modeled.
Area of Science:
- Solar physics
- Plasma astrophysics
- Space weather
Background:
- Hard X-ray imaging spectrometers are crucial for understanding solar flares.
- Simultaneous observations from multiple viewpoints are needed for 3D analysis.
Purpose of the Study:
- To demonstrate the novel capability of multi-viewpoint hard X-ray imaging for solar flares.
- To report the first 3D triangulation of hard X-ray sources in a solar flare.
Main Methods:
- Utilized data from the Hard X-ray Imager (HXI) on ASO-S and the Spectrometer/Telescope for Imaging X-rays (STIX) on Solar Orbiter.
- Performed 3D triangulation of hard X-ray sources observed during the SOL2023-12-31T21:55 X5 flare.
- Analyzed observer separation angle of 18° for multi-viewpoint analysis.
Main Results:
- Successfully triangulated the brightest hard X-ray regions, characterizing the flare's 3D geometry.
- Determined footpoint locations within the chromosphere and a looptop source altitude of 15.1 ± 1 Mm.
- Implied a more elongated magnetic-loop structure than predicted by semi-circular models.
Conclusions:
- Joint HXI and STIX observations offer powerful diagnostics for 3D solar flare geometry.
- This multi-viewpoint approach advances our understanding of magnetic-loop structures in flares.
- Further exploitation of this capability will enhance solar flare research.
Keywords:
Flares, impulsive phaseFlares, spectrumInstrumentation and data managementIntegrated Sun observationsSpectrum, X-rayMore Related Videos
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