Solar-Terrestrial Physics Solar-Terrestrial Physics Солнечно-земная физика / Solnechno-Zemnaya Fizika / Solar-Terrestrial Physics 2712-9640 66032 10.12737/szf-94202303 Результаты исследований Results of current research Результаты исследований Active longitudes and the structure of the large-scale magnetic field at solar minimum Активные долготы и структура крупномасштабного магнитного поля в минимуме солнечной активности Григорьев Виктор Михайлович Grigoryev Victor Mikhailovich vgrig@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Ермакова Людмила Викторовна Ermakova Lyudmila Victorovna lermak@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation 20 12 2023 20 12 2023 9 4 30 37 29 06 2023 12 09 2023 https://zh-szf.ru/en/nauka/article/66032/view

По данным каталогов групп солнечных пятен RGO и USAF/NOAA рассмотрены глубокие минимумы 11-летних циклов солнечной активности 13–14, 14–15, 22–23, 23–24, 24–25. Все они имеют большое количество беспятенных дней. Несмотря на это, активные долготы как предпочтительные зоны, где возникают солнечные пятна, проявляются на этой стадии цикла. Анализ синоптических карт и отдельных ежедневных магнитограмм WSO (Wilcox Solar Observatory), отражающих структуру слабого крупномасштабного поля, обнаруживает неосесимметричную компоненту магнитного поля Солнца. В минимуме активности в структуре крупномасштабного магнитного поля наблюдаются вытянутые вдоль меридиана области положительной и отрицательной полярностей, пересекающие экватор. Наиболее заметные из них находятся в зоне активных долгот и часто связаны с полярными магнитными полями. Обсуждается возможная природа меридиональных структур крупномасштабного поля в период минимума активности. Возможно, это связано с гигантскими ячейками конвекции, имеющими структуру банановых ячеек.

We have studied deep minima of 11-year solar activity cycles 13–14, 14–15, 22–23, 23–24, 24–25, using the RGO and USAF/NOAA sunspot group catalogs. All of them have a large number of spotless days. Nonetheless, active longitudes as preferred zones, where sunspots occur, appear at this solar cycle phase. Analysis of synoptic maps and WSO daily magnetograms reflecting the structure of a weak large-scale field shows a non-axisymmetric component of the solar magnetic field. At solar minimum in the structure of the large-scale magnetic field, there are regions of the magnetic field of positive and negative polarity elongated along the meridian and crossing the equator. The most pronounced of them are located in the zone of active longitudes and are often connected with the polar magnetic fields. We discuss the possible nature of the meridional structures of the large-scale field during solar minimum. This might be due to giant convection cells with a banana cell structure.

 крупномасштабное магнитное поле активные области large-scale magnetic field active regions Работа выполнена при финансовой поддержке Минобрнауки России (субсидия №075-ГЗ/Ц3569/278) The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (Subsidy No. 075-GZ/Ts3569/278)

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