Twin Null-Point-Associated Major Eruptive Three-Ribbon Flares with Unusual Microwave Spectra
On 23 July 2016 after 05:00\,UTC, the first 48-antenna stage of the Siberian Radioheliograph detected two flares of M7.6 and M5.5 GOES importance that occurred within half an hour in the same active region. Their multi-instrument analysis reveals the following. The microwave spectra were flattened a...
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Main Authors | , , , , , , , , , |
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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 of M7.6 and M5.5 GOES importance that 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. The unusual properties of the microwave spectra are accounted for by a distributed multi-loop system in an asymmetric magnetic configuration that our modeling confirms. Microwave images did not to resolve compact configurations in these flares that 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 three-ribbon eruptive flares in a configuration with a coronal-null region, the first eruption causes a flare and facilitates the second eruption that also results in a flare. |
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AbstractList | Solar Physics, 295(2020), 128 On 23 July 2016 after 05:00\,UTC, the first 48-antenna stage of the Siberian
Radioheliograph detected two flares of M7.6 and M5.5 GOES importance that
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. The unusual properties of the microwave spectra are accounted for by a
distributed multi-loop system in an asymmetric magnetic configuration that our
modeling confirms. Microwave images did not to resolve compact configurations
in these flares that 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 three-ribbon eruptive
flares in a configuration with a coronal-null region, the first eruption causes
a flare and facilitates the second eruption that also results in a flare. On 23 July 2016 after 05:00\,UTC, the first 48-antenna stage of the Siberian Radioheliograph detected two flares of M7.6 and M5.5 GOES importance that 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. The unusual properties of the microwave spectra are accounted for by a distributed multi-loop system in an asymmetric magnetic configuration that our modeling confirms. Microwave images did not to resolve compact configurations in these flares that 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 three-ribbon eruptive flares in a configuration with a coronal-null region, the first eruption causes a flare and facilitates the second eruption that also results in a flare. |
Author | Uralov, A M Zhdanov, D A Altyntsev, A T Lesovoi, S V Myshyakov, I I Globa, M V Grechnev, V V Kochanov, A A Meshalkina, N S Kiselev, V I |
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BackLink | https://doi.org/10.48550/arXiv.2009.10350$$DView paper in arXiv https://doi.org/10.1007/s11207-020-01702-3$$DView published paper (Access to full text may be restricted) |
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Snippet | On 23 July 2016 after 05:00\,UTC, the first 48-antenna stage of the Siberian Radioheliograph detected two flares of M7.6 and M5.5 GOES importance that occurred... Solar Physics, 295(2020), 128 On 23 July 2016 after 05:00\,UTC, the first 48-antenna stage of the Siberian Radioheliograph detected two flares of M7.6 and M5.5... |
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SubjectTerms | Configurations Flares Gamma rays Microwave spectra Physics - Solar and Stellar Astrophysics X ray sources X-rays |
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Title | Twin Null-Point-Associated Major Eruptive Three-Ribbon Flares with Unusual Microwave Spectra |
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