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Twin Null-Point-Associated Major Eruptive Three-Ribbon Flares with Unusual Microwave Spectra

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Abstract

On 23 July 2016 after 05:00 UTC, the first 48-antenna stage of the Siberian Radioheliograph detected two flares, M7.6 and M5.5, which occurred within half an hour in the same active region. Their multi-instrument analysis reveals the following. The microwave spectra were flattened at low frequencies and the spectrum of the stronger burst had a lower turnover frequency. Each flare was eruptive, emitted hard X-rays and \(\gamma \)-rays exceeding 800 keV, and had a rare three-ribbon configuration. An extended hard X-ray source associated with a longest middle ribbon was observed in the second flare. Unusual properties of the microwave spectra are accounted for by a distributed multi-loop system in an asymmetric magnetic configuration that our modeling supports. Microwave images did not resolve compact configurations in these flares, which may also be revealed incompletely in hard X-ray images because of their limited dynamic range. Being apparently simple and compact, non-thermal sources corresponded to the structures observed in the extreme ultraviolet. In the scenario proposed for two successive eruptive flares in a configuration with a coronal magnetic null, the first filament eruption causes a flare and facilitates the second eruption that also results in a flare. Three persistent flare ribbons reflect magnetic reconnection at the coronal-null region forced by the filament motions.

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Acknowledgements

We thank L.K. Kashapova for useful discussions. We appreciate our colleagues from the Radio Astrophysical Department and the Radio Astrophysical Observatory in Badary. We thank the anonymous reviewer for valuable remarks and suggestions, which helped us to refine the article.

This study was funded by the Russian Science Foundation under grant 18-12-00172. The development of the methods used in Sections 2.1 and 4 was supported by the Basic Research Program II.16. The SRH and BBMS data were obtained using the Unique Research Facility Siberian Solar Radio Telescope (ckp-rf.ru/usu/73606).

We thank the NASA/SDO and the AIA and HMI science teams, the teams operating RHESSI, the Nobeyama solar facilities, and the US AF RSTN network for the data used here. We thank the International Consortium for the continued operation of Nobeyama Radioheliograph until shut down on 31 March 2020. We are grateful to the team maintaining the CME Catalog at the CDAW Data Center by NASA and the Catholic University of America in cooperation with the Naval Research Laboratory.

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  1. Institute of Solar-Terrestrial Physics SB RAS, Lermontov St. 126A, Irkutsk, 664033, Russia

    V. V. Grechnev, N. S. Meshalkina, A. M. Uralov, A. A. Kochanov, S. V. Lesovoi, I. I. Myshyakov, V. I. Kiselev, D. A. Zhdanov, A. T. Altyntsev & M. V. Globa

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  1. V. V. Grechnev
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  2. N. S. Meshalkina
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  3. A. M. Uralov
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  4. A. A. Kochanov
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  5. S. V. Lesovoi
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  6. I. I. Myshyakov
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  7. V. I. Kiselev
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  8. D. A. Zhdanov
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  9. A. T. Altyntsev
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Correspondence to V. V. Grechnev.

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Grechnev, V.V., Meshalkina, N.S., Uralov, A.M. et al. Twin Null-Point-Associated Major Eruptive Three-Ribbon Flares with Unusual Microwave Spectra. Sol Phys 295, 128 (2020). https://doi.org/10.1007/s11207-020-01702-3

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  • DOI: https://doi.org/10.1007/s11207-020-01702-3

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