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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">Geomagnetism and Aeronomy</journal-id><journal-title-group><journal-title xml:lang="en">Geomagnetism and Aeronomy</journal-title><trans-title-group xml:lang="ru"><trans-title>Геомагнетизм и аэрономия</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0016-7940</issn><issn publication-format="electronic">3034-5022</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">688272</article-id><article-id pub-id-type="doi">10.31857/S0016794025040018</article-id><article-id pub-id-type="edn">EXCAIG</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">Magnetic flux ropes as models of a solar flare and transition of flare filament into CMI-regim of motion</article-title><trans-title-group xml:lang="ru"><trans-title>Жгутовые модели солнечных вспышек и переход вспышечного волокна в режим коронального выброса</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Solov’ev</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Соловьев</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>solov@gaoran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Korolkova</surname><given-names>О. А.</given-names></name><name xml:lang="ru"><surname>Королькова</surname><given-names>О. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>korolkova@gaoran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kirichek</surname><given-names>Е. А.</given-names></name><name xml:lang="ru"><surname>Киричек</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>elenakirichek@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo</institution></aff><aff><institution xml:lang="ru">Главная (Пулковская) астрономическая обсерватория РАН (ГАО РАН)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-04" publication-format="electronic"><day>04</day><month>09</month><year>2025</year></pub-date><volume>65</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>421</fpage><lpage>429</lpage><history><date date-type="received" iso-8601-date="2025-07-25"><day>25</day><month>07</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-07-25"><day>25</day><month>07</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">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/0016-7940/article/view/688272">https://journals.eco-vector.com/0016-7940/article/view/688272</self-uri><abstract xml:lang="en"><p>A new physical mechanism of flare energy release in force-free magnetic flux ropes is described: as the top of the magnetic rope-loop enters the corona, the external pressure <italic>G</italic>, which keeps it from expanding, steadily decreases. At its critically low value, the longitudinal field tends to zero on the magnetic surface where the currents change sign, and the force-free parameter and azimuthal current near this surface grow without limit, approaching the rupture. This excites plasma turbulence in the rope and serves as a flare trigger. Rapid dissipation of the field and currents on the anomalous plasma resistance induces an electric field much higher than the Dreiser field. The forces acting on the flare filament in the corona are described, and the conditions for its transition to the dynamic CME regime are discussed.</p></abstract><trans-abstract xml:lang="ru"><p>Описан новый физический механизм вспышечного энерговыделения в бессиловых магнитных жгутах: по мере выхода вершины жгутовой магнитной петли в корону Солнца внешнее давление, удерживающее жгут от бокового расширения, неуклонно падает. При некотором критически низком значении этого давления продольное магнитное поле жгута стремится к нулю на той магнитной поверхности, где токи меняют знак. При этом азимутальный ток и бессиловой параметр начинают неограниченно возрастать, приближаясь к разрыву на этой поверхности. Это приводит к возбуждению плазменной ионно-звуковой неустойчивости в плазме жгута и служит триггером для начала вспышки. Быстрая диссипация энергии токов и магнитного поля на аномальном сопротивлении плазмы индуцирует электрические поля, значительно превышающие поле Дрейсера. В работе обсуждаются силы, действующие в солнечной короне на вспышечное волокно, и условия его перехода в динамический режим коронального выброса массы.</p></trans-abstract><kwd-group xml:lang="en"><kwd>solar flare</kwd><kwd>magnetic field</kwd><kwd>force-free magnetic flux rope</kwd><kwd>plasma instability</kwd><kwd>equilibrium of filament</kwd><kwd>coronal mass ejection</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>солнечные вспышки</kwd><kwd>магнитное поле</kwd><kwd>бессиловой магнитный жгут</kwd><kwd>плазменная неустойчивость</kwd><kwd>равновесие магнитных жгутов</kwd><kwd>корональные выбросы масс</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source></award-group><funding-statement xml:lang="en">The work was carried out within the framework of the State assignment of the Main (Pulkovo) Astronomical Observatory of the Russian Academy of Sciences.</funding-statement><funding-statement xml:lang="ru">Работа выполнена в рамках Государственного задания Главной (Пулковской) астрономической обсерватории РАН.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Арцимович Л.А., Сагдеев Р.3. 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