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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Astronomy Reports</journal-id><journal-title-group><journal-title xml:lang="en">Astronomy Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Астрономический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0004-6299</issn><issn publication-format="electronic">3034-5170</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">647690</article-id><article-id pub-id-type="doi">10.31857/S0004629924120086</article-id><article-id pub-id-type="edn">IBVUPZ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">To the question of north-south asymmetry of solar activity in the 25th Schwabe-Wolf cycle</article-title><trans-title-group xml:lang="ru"><trans-title>К вопросу о северо-южной асимметрии солнечной активности в 25-м цикле Швабе-Вольфа</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yazev</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Язев</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>syazev@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Isaeva</surname><given-names>Е. S.</given-names></name><name xml:lang="ru"><surname>Исаева</surname><given-names>Е. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>syazev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tomozov</surname><given-names>V. M.</given-names></name><name xml:lang="ru"><surname>Томозов</surname><given-names>В. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>syazev@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>K. I.</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>К. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>syazev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Hos-Erdene</surname><given-names>B.</given-names></name><name xml:lang="ru"><surname>Хос-Эрдэнэ</surname><given-names>Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>syazev@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Irkutsk State University</institution></aff><aff><institution xml:lang="ru">Иркутский государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Solar-Terrestrial Physics of the Siberian Branch of the RAS</institution></aff><aff><institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Institute of Astronomy and Geophysics MAS</institution></aff><aff><institution xml:lang="ru">Институт астрономии и геофизики МАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>101</volume><issue>12</issue><fpage>1107</fpage><lpage>1116</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, The Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">The Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0004-6299/article/view/647690">https://journals.eco-vector.com/0004-6299/article/view/647690</self-uri><abstract xml:lang="en"><p>An analysis of the north-south asymmetry (NSA) of the groups of sunspots and flares location during the growth phase of the 25th Schwabe-Wolf cycle of solar activity was performed. During the first four years of the cycle’s development, sunspot activity increased quasi-synchronously in the northern and southern hemispheres; the module of the NSA coefficient during this period decreased from 0.6 to 0.2. The longitudinal distribution of sunspots in the second half of 2023 was uneven and similar in both hemispheres; groups of sunspots appeared during this period mainly in the longitudinal intervals of 30–100°, as well as 200–280°, at other longitudes activity was reduced, as in the northern, and in the southern hemispheres. The number of flares of all classes was 45% in the northern hemisphere, 42% in the southern hemisphere, 13% were not identified. The flare index was distributed between the hemispheres in the ratio of 49.5% to 42%, 8.5% were not identified. A comparison with the 24th cycle shows that NSA in the distribution of sunspots and flares between the northern and southern hemispheres in the current (25th) cycle is significantly lower than in the previous one. A high degree of symmetry of activity can ensure a greater height of the 25th cycle compared to the 24th, as well as the single-peaked nature of the 25th cycle. It is hypothesized that in the 25th cycle there is a higher level of dipole parity of the global magnetic field compared to the 24th cycle.</p></abstract><trans-abstract xml:lang="ru"><p>Выполнен анализ северно-южной асимметрии (NSA) расположения групп солнечных пятен и вспышек на фазе роста 25-го цикла Швабе-Вольфа солнечной активности. Активность пятен на протяжении первых четырех лет развития цикла нарастала квазисинхронно в северном и южном полушариях, модуль коэффициента NSA в этот период снижался от 0.6 до 0.2. Долготное распределение пятен во второй половине 2023 г. было неравномерным и сходным в обоих полушариях, группы пятен возникали в этот период преимущественно в долготных интервалах 30–100°, а также 200–280°, на остальных долготах активность была пониженной, как в северном, так и в южном полушариях. Количество вспышек всех классов составило 45٪ в северном полушарии, 42% в южном, 13% из них не отождествлены. Вспышечный индекс распределился между полушариями в соотношении 49.5% к 42%, 8.5% – не отождествлены. Сравнение с 24-м циклом показывает, что NSA в распределении пятен и вспышек между северным и южным полушариями в текущем (25-м) цикле существенно ниже, чем в предыдущем. Высокая степень симметрии активности может обеспечить большую высоту 25-го цикла по сравнению с 24-м, а также одновершинность 25-го цикла. Выдвинута гипотеза о том, что в 25-м цикле наблюдается более высокий уровень дипольной четности глобального магнитного поля по сравнению с 24-м циклом.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Sun</kwd><kwd>sunspots</kwd><kwd>flares</kwd><kwd>north-south asymmetry</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Солнце</kwd><kwd>солнечные пятна</kwd><kwd>вспышки</kwd><kwd>северно-южная асимметрия</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap></funding-source><award-id>075-ГЗ/113569/278</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>N.V. Zolotova, D.I. Ponyavin, N. Marwan, J. 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