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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">647617</article-id><article-id pub-id-type="doi">10.31857/S0004629924030053</article-id><article-id pub-id-type="edn">KJSTYR</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">Transition from super-alfvenic to sub-alfvenic stellar wind flow passing by an exoplanet, using the example of HD 209458b</article-title><trans-title-group xml:lang="ru"><trans-title>Переход от сверхальфвеновского к доальфвеновскому обтеканию экзопланеты звездным ветром на примере HD 209458b</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Belenkaya</surname><given-names>E. S.</given-names></name><name xml:lang="ru"><surname>Беленькая</surname><given-names>Е. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>elena@dec1.sinp.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU)</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова, Научно-исследовательский институт ядерной физики им. Д. В. Скобельцына (НИИЯФ МГУ)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2024</year></pub-date><volume>101</volume><issue>3</issue><issue-title xml:lang="ru"/><fpage>244</fpage><lpage>249</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/647617">https://journals.eco-vector.com/0004-6299/article/view/647617</self-uri><abstract xml:lang="en"><p>Depending on the distance of the exoplanet from the central star and on the properties of this star, different regimes of stellar wind flow around it arise. If the exoplanet is at a distance up to the Alfven radius at which the wind speed is equal to the Alfven speed, or the Alfven Mach number M<sub>A</sub> = 1, then the exoplanet generates Alfven wings. If it is located beyond the Alfven radius, a comet-like magnetosphere appears, like that of the planets of the Solar System. The paper examines how the transition from one flow regime to another can be described on the base of a paraboloid model of the magnetospheric magnetic field using the example of exoplanet HD 209458b.</p></abstract><trans-abstract xml:lang="ru"><p>В зависимости от расстояния между экзопланетой и центральной звездой и от свойств этой звезды возникают разные режимы обтекания звездным ветром. Если экзопланета находится на расстоянии до альфвеновского радиуса, на котором скорость ветра равна альфвеновской скорости, или альфвеновское число Маха M<sub>A</sub> = 1, то экзопланета генерирует альфвеновские крылья. Если она расположена за альфвеновским радиусом, возникает кометообразная магнитосфера, как у планет Солнечной системы. В работе рассматривается, как переход от одного режима обтекания к другому может быть описан в рамках параболоидной модели магнитного поля магнитосферы на примере экзопланеты HD 209458b.</p></trans-abstract><kwd-group xml:lang="en"><kwd>magnetosphere</kwd><kwd>exoplanet</kwd><kwd>alfven wings</kwd><kwd>stellar wind</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>магнитосфера</kwd><kwd>экзопланета</kwd><kwd>альфвеновские крылья</kwd><kwd>звездный ветер</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>A. A. Vidotto, M. Jardine, J. Morin, J. F. Donati, P. Lang, and A. Russell, Astron. and Astrophys. 557, id. A67 (2013).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Y. Vernisse, J.A. Riousset, U. Motschmann, and K.H. Glassmeier, Planet. 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