Nonthermal sources from stereoscopic hard X-ray and earth-based microwave observations in a data-constrained magnetohydrodynamic simulation
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Autor:in (Körperschaft)
Publikationsdatum
2026
Typ der Arbeit
Studiengang
Sammlung
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
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Übergeordnetes Werk
The Astrophysical Journal
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DOI der Originalpublikation
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Reihe / Serie
Reihennummer
Jahrgang / Band
1006
Ausgabe / Nummer
2
Seiten / Dauer
240
Patentnummer
Verlag / Herausgebende Institution
IOP Publishing
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Auflage
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Abtretungsempfänger:in
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Zusammenfassung
We analyze the X7.1 flare on 2024 October 1 from NOAA AR 13842 using hard X-ray (HXR) imaging, microwave observations by the Expanded Owens Valley Solar Array (EOVSA), and a three-dimensional magnetohydrodynamic (MHD) simulation. The flare was observed from two vantage points, with Solar Orbiter/Spectrometer Telescope for Imaging X-rays viewing the flare near the limb and Advanced Space-based Solar Observatory/Hard X-ray Imager and EOVSA observing it on the disk. We carried out a data-constrained MHD simulation using a nonlinear force-free field extrapolation as the initial condition and constrained the height of the nonthermal loop-top source from stereoscopic HXR and microwave observations. The height is consistent between the stereoscopic analysis and the MHD simulation. A secondary nonthermal microwave source aligned with a southward plasma ejection corresponds to an elongated current sheet. Although the current sheet grows in multiple directions, the secondary microwave emission is observed only from the southern segment. This localization suggests reconnection in regions with different magnetic field strengths. Reconnection in strong-field regions produces flare arcades with dominant loop-top emission, whereas reconnection in weaker southern regions gives rise to secondary microwave emission at higher altitudes. The height of the secondary source is consistent between the stereoscopic analysis and the MHD simulation. Microwave spectral fitting suggests a higher low-energy cutoff for nonthermal electrons in the secondary microwave source than in the main loop-top source. This may reflect the transport of electrons preaccelerated near the loop-top source by the southward plasma ejection.
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Veranstaltung
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Enddatum der Ausstellung
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Datum der letzten Prüfung
ISBN
ISSN
0004-637X
1538-4357
1538-4357
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
peer-reviewed
Open Access-Status
Gold
Lizenz
Zitation
Matsumoto, K., Inoue, S., Wang, M., Chen, B., Stiefel, M., Krucker, S., Masuda, S., & Wang, H. (2026). Nonthermal sources from stereoscopic hard X-ray and earth-based microwave observations in a data-constrained magnetohydrodynamic simulation. The Astrophysical Journal, 1006(2), 240. https://doi.org/10.3847/1538-4357/ae84b8