Observation of “Topological” Microflares in the Solar Atmosphere

Dumin, Yurii V.; Сомов, Б. В.

doi:10.3847/2515-5172/aa9928

Cited by 2 publications

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Section: Theoretical Modelmentioning

confidence: 99%

“…in the appearance of the additional (bifurcated) null point at the separator well above the plane of sources; and its position considerably changes under a tiny displacement of the fourth source (for recent observational evidence of this effect, resulting in the fast ignition of magnetic reconnection, seeDumin & Somov 2017). Yet another interesting phenomenon, immediately related to the interpretation of anemone structures, can be found if we assume the existence of an energy-release region at the top of the separator.…”

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Topological model of the anemone microflares in the solar chromosphere

Dumin

Сомов

2019

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Context. The chromospheric anemone microflares, which were discovered by Hinode satellite about a decade ago, are specific transient phenomena starting from a few luminous ribbons on the chromospheric surface and followed by an eruption upward. While the eruptive stage was studied in sufficient detail, a quantitative theory of formation of the initial multi-ribbon structure remains undeveloped until now. Aims. We construct a sufficiently simple but general model of the magnetic field sources that is able to reproduce all the observed types of luminous ribbons by varying only a single parameter. Methods. As a working tool, we employed the Gorbachev-Kel'ner-Somov-Shvarts (GKSS) model of the magnetic field, which was originally suggested about three decades ago to explain fast ignition of the magnetic reconnection over considerable spatial scales by tiny displacements of the magnetic sources. Quite unexpectedly, this model turns out to be efficient for the description of generic multi-ribbon structures in the anemone flares as well.Results. As follows from our numerical simulation, displacement of a single magnetic source (sunspot) with respect to three other sources results in a complex transformation from three to four ribbons and then again to three ribbons, but with an absolutely different arrangement. Such structures closely resemble the observed patterns of emission in the anemone microflares.

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Section: Theoretical Modelmentioning

confidence: 99%

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confidence: 99%