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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">647637</article-id><article-id pub-id-type="doi">10.31857/S0004629924050051</article-id><article-id pub-id-type="edn">JNXCAY</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">Microstructure in Radio Emission of the Pulsar B1133+16 at a Frequency of 111 MHz</article-title><trans-title-group xml:lang="ru"><trans-title>Микроструктура импульсов пульсара B1133+16 на частоте 111 МГц</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popov</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Попов</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>popov069@asc.rssi.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">P. N. Lebedev Physical Institute of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Физический институт им. П. Н. Лебедева Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2024</year></pub-date><volume>101</volume><issue>5</issue><issue-title xml:lang="ru"/><fpage>455</fpage><lpage>468</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/647637">https://journals.eco-vector.com/0004-6299/article/view/647637</self-uri><abstract xml:lang="en"><p>This study is based on observations of the pulsar B1133+16 conducted on the BSA PRAO antenna array at a frequency of 111 MHz with continuous recording of undetected signal (voltage) in the 2.5 MHz band, providing time resolution 0.2 microseconds. From 30 observing sessions, 570 strong pulses were selected for the subsequent analysis of microstructure parameters. The analysis was performed by computing autocorrelation functions separately for the three components of the mean profile: two extreme main components <italic>I </italic>and <italic>II </italic>and for the central weak component <italic>S </italic>in the profile saddle. For the component <italic>S </italic>microstructure analysis was performed for the first time. Distributions have been constructed by the following parameters: time scales <italic>τ</italic><sub>µ,</sub> modulation depth <italic>m</italic><sub>µ,</sub> and the parameter <italic>d,</italic> which characterizes the shape of the micropulses. Noticeable differences were found in some parameters for different profile components. The discovered features were interpreted in the model of hollow cone with a central component. It was believed that the radio emission of the extreme components (<italic>I </italic>and <italic>II</italic>) is generated by ordinary mode O, and the radio emission of the central component is provided by extraordinary mode X. Under this interpretation the radio emission output heights above the polar cap, were estimated to be 45 and 280 km for the X and O modes, respectively. A noticeable deformation of the X mode emission cone relative to the central component <italic>S </italic>was mentioned. Considerations are presented that point to the spatial structure of the secondary plasma flow, elongated along the meridians of the magnetic field.</p></abstract><trans-abstract xml:lang="ru"><p>Данная работа основана на наблюдениях пульсара В1133+16, выполненных на антенной решетке БСА ПРАО на частоте 111 МГц с непрерывной регистрацией недетектированного сигнала (напряжения) в полосе 2.5 МГц, обеспечивающей временное разрешение 0.2 мкс. Из 30 наблюдательных сеансов было выбрано 570 сильных импульсов для анализа параметров микроструктуры. Такой анализ выполнен путем вычисления автокорреляционных функций отдельно для трех компонентов среднего профиля: двух крайних основных компонентов <italic>I </italic>и <italic>II </italic>и для центрального слабого компонента <italic>S </italic>в седловине среднего профиля. Для компонента <italic>S </italic>анализ микроструктуры был выполнен впервые. Построены распределения по временным масштабам <italic>τ</italic><sub>µ,</sub> по глубине модуляции <italic>m</italic><sub>µ </sub>и по параметру <italic>d,</italic> характеризующему форму микроимпульсов. Выявлены различия в некоторых параметрах для разных компонентов среднего профиля. Обсуждены обнаруженные особенности в модели радиоизлучения полого конуса с центральным компонентом, при этом считается, что радиоизлучение крайних компонентов образуется обыкновенной модой О, а радиоизлучение центрального компонента обеспечивается необыкновенной модой Х. В этой интерпретации определены уровни выхода радиоизлучения над полярной шапкой, которые оказались равны 45 км и 280 км для Х и О мод соответственно. Отмечена заметная деформация конуса излучения моды Х относительно центрального компонента <italic>S.</italic> Представлены соображения, указывающие на пространственную структуру потока вторичной плазмы, вытянутую вдоль меридианов магнитного поля.</p></trans-abstract><kwd-group xml:lang="en"><kwd>numerical methods</kwd><kwd>interstellar gas</kwd><kwd>index refraction of radio waves</kwd><kwd>ionosphere: theories</kwd><kwd>influence of the ionosphere</kwd><kwd>distribution</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>численные методы</kwd><kwd>межзвездный газ</kwd><kwd>показатель преломления радиоволн</kwd><kwd>ионосфера: теории</kwd><kwd>влияния ионосферы</kwd><kwd>распределение</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>D. R. Lorimer and M. Kramer, Handbook of Pulsar Astronomy (Cambridge, UK: Cambridge University Press, 2012).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>T. 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