Dynamics of small-scale magnetic fields before small and large solar flares

Боровик Александр Васильевич; Жданов Антон Андреевич

doi:10.12737/stp-94202305

УДК 52

DYNAMICS OF SMALL-SCALE MAGNETIC FIELDS BEFORE SMALL AND LARGE SOLAR FLARES Dynamics of small-scale magnetic fields before small and large solar flares

АА Аа

Опубликовано в Solar-Terrestrial Physics · Том 9, Номер 4 · Страницы 37–45 · Рубрика: Results of current research

DOI: https://doi.org/10.12737/stp-94202305

Получено: 02.09.2023 Одобрено: 09.11.2023 Опубликовано: 28.12.2023 Язык публикаций: ENG

Авторы

БО

Боровик Александр Васильевич

ORCID

ЖД

Жданов Антон Андреевич

ORCID

БО

Боровик Александр Васильевич

Ученая степень: кандидат физико-математических наук

Институт солнечно-земной физики СО РАН Россия · Иркутск

ORCID

ЖД

Жданов Антон Андреевич

Институт солнечно-земной физики СО РАН Россия · Иркутск

ORCID

АННОТАЦИЯ

We have examined the dynamics of the longitudinal magnetic field of active region NOAA 12673, using data from the Solar Dynamics Observatory (SDO). During the passage of the active region (AR) across the solar disk, its spots and background fields showed complex motion trajectories, and numerous small-scale short-lived local polarity inversion lines (LPILs) were formed when new magnetic fluxes appeared in the AR and came closer to fields of opposite polarity. The length of LPILs was less than 15.000 km (~20 arcsec); their lifetime was several hours. Study of the flare activity of NOAA 12673 has shown that low-power flares (optical class S, area ˂2 sq. degrees) generally occur near LPILs. Before small flares and the September 06, 2017 large flare (optical importance 3B, X-ray class X9.3), in limited sites of local and main polarity inversion lines there were shear stresses and an increase in the magnetic field gradient: in the region of low-power flares, to 1.3–1.5 G/km; in the region of the large flare, 3–3.5 G/km. The results obtained suggest that the longitudinal magnetic field behaves similarly before both small and large flares.

КЛЮЧЕВЫЕ СЛОВА

flares, magnetic fields, polarity inversion lines

Финансирование

The work was financially supported by Basic Research Program II.16

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Главный редактор

Жеребцов Гелий Александрович

solater@iszf.irk.ru

Заместитель главного редактора

Степанов Александр Владимирович

stepanov@gaoran.ru

Заместитель главного редактора

Потапов Александр Сергеевич

potapov@iszf.irk.ru

Ответственный секретарь редакции

Полюшкина Наталья Александровна

npol@iszf.irk.ru

3885

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ГОСТ

Боровик А. В., Жданов А. А. Dynamics of small-scale magnetic fields before small and large solar flares // Solar-Terrestrial Physics. 2023. №. 4. С. 37-45. DOI: https://doi.org/10.12737/stp-94202305. (дата обращения: 22.09.2026).

MLA

Боровик Александр Васильевич, Жданов А. А.. "Dynamics of small-scale magnetic fields before small and large solar flares." Solar-Terrestrial Physics 9.4 (2023): 37-45. DOI: https://doi.org/10.12737/stp-94202305.

APA

Боровик А. В., Жданов А. А. (2023). Dynamics of small-scale magnetic fields before small and large solar flares. Solar-Terrestrial Physics, 9(4), 37-45. https://doi.org/10.12737/stp-94202305

Chicago

Боровик Александр Васильевич, Жданов А. А.. "Dynamics of small-scale magnetic fields before small and large solar flares." Solar-Terrestrial Physics 9, no. 4 (2023): 37-45. https://doi.org/10.12737/stp-94202305.

WIKI

{{cite journal | author = Боровик А. В., Жданов А. А. | title = Dynamics of small-scale magnetic fields before small and large solar flares | journal = Solar-Terrestrial Physics | year = 2023 | volume = 9 | issue = 4 | pages = 37-45 | doi = 10.12737/stp-94202305 }}

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DYNAMICS OF SMALL-SCALE MAGNETIC FIELDS BEFORE SMALL AND LARGE SOLAR FLARES Dynamics of small-scale magnetic fields before small and large solar flares

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