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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Solnechno-Zemnaya Fizika</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Solnechno-Zemnaya Fizika</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Солнечно-земная физика</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="online">2712-9640</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">48923</article-id>
   <article-id pub-id-type="doi">10.12737/szf-83202207</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>Результаты  исследований</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>Results of current research</subject>
    </subj-group>
    <subj-group>
     <subject>Результаты  исследований</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Structure of groups of eigenfrequencies in spectra of geomagnetic pulsations in the nightside magnetosphere</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Структура групп собственных частот в спектрах геомагнитных пульсаций ночной стороны магнитосферы</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Поляков</surname>
       <given-names>Андрей Редженальдович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Polyakov</surname>
       <given-names>Andrey Redzhenaldovich</given-names>
      </name>
     </name-alternatives>
     <email>polar@iszf.irk.ru</email>
     <bio xml:lang="ru">
      <p>кандидат физико-математических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>candidate of physical and mathematical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution>
     <city>Иркутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Institute of Solar-Terrestrial Physics SB RAS</institution>
     <city>Irkutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2022-09-30T20:55:38+03:00">
    <day>30</day>
    <month>09</month>
    <year>2022</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2022-09-30T20:55:38+03:00">
    <day>30</day>
    <month>09</month>
    <year>2022</year>
   </pub-date>
   <volume>8</volume>
   <issue>3</issue>
   <fpage>49</fpage>
   <lpage>53</lpage>
   <history>
    <date date-type="received" iso-8601-date="2022-02-15T00:00:00+03:00">
     <day>15</day>
     <month>02</month>
     <year>2022</year>
    </date>
    <date date-type="accepted" iso-8601-date="2022-06-15T00:00:00+03:00">
     <day>15</day>
     <month>06</month>
     <year>2022</year>
    </date>
   </history>
   <self-uri xlink:href="https://zh-szf.ru/en/nauka/article/48923/view">https://zh-szf.ru/en/nauka/article/48923/view</self-uri>
   <abstract xml:lang="ru">
    <p>С помощью новой техники метода корреляционной функции флуктуаций амплитуды и фазы (КФАФ) обработаны записи флуктуаций компонент геомагнитного поля в обсерваториях Монды и Борок для ряда часовых интервалов ночной стороны магнитосферы. Метод позволяет детектировать группы эквидистантных частот в спектре исходного сигнала и измерять разность двух соседних частот в каждой группе. &#13;
Показано, что как и для флуктуаций дневной стороны [Поляков, 2018], группы эквидистантных частот в составе широкополосных спектров этих флуктуаций определяются собственными частотами 2D-резонатора альфвеновских волн. Установлена экспериментальная зависимость некоторой комбинации параметров этого резонатора от местного времени. Совпадение структурных элементов в конечных продуктах обработки компонент север—юг (СЮ) и восток—запад (ВЗ) альфвеновских флуктуаций практически для всех часовых интервалов убедительно свидетельствует о достоверности результатов техники КФАФ при обработке любых широкополосных сигналов.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Using a new method of correlation function for amplitude and phase fluctuations (APCF), records of geomagnetic field component fluctuations (observatories Mondy and Borok) have been processed for a number of hour zones of the nightside magnetosphere. This method is meant to detect groups of equidistant frequencies inside the spectrum of source signal and also to measure a difference between two neighbor frequencies in each of these groups.&#13;
The groups of equidistant frequencies in broadband spectra of these fluctuations are shown to depend on eigenfrequencies of the 2D Alfvén wave resonator, just as for dayside fluctuations [Polyakov, 2018]. An empirical relation has been found between a combination of parameters of this resonator and local time. The similarity between structural elements in the final products of processing of Alfvén fluctuation N-S and E-W components for almost all hour zones clearly indicates the reliability of the results of the APCF method in processing any broadband signals.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>техника обработки сигналов; корреляционная функция; собственные частоты</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>signal processing technique</kwd>
    <kwd>correlation function</kwd>
    <kwd>eigenfrequencies</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Минобрнауки России</funding-statement>
    <funding-statement xml:lang="en">The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation</funding-statement>
   </funding-group>
  </article-meta>
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 <back>
  <ref-list>
   <ref id="B1">
    <label>1.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Леонович А.С., Мазур В.А. Динамика мелкомасштабных альвеновских волн в магнитосферном резонаторе. Физика плазмы. 1987. Т. 13, вып. 7. С. 800-810.</mixed-citation>
     <mixed-citation xml:lang="en">Lee D.-H., Lysak R.L. Numerical studies on ULF wave structures in the dipole model, in: Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves. Geophys. Monograph Ser. 1994, vol. 81, pp. 293-297.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B2">
    <label>2.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Поляков А.Р. Новый метод обработки записей сейсмических колебаний, основанный на анализе корреляционных функций случайных флуктуаций амплитуды и фазы. Ч. 1-2. Солнечно-земная физика. 2010. Вып. 15. С. 44-57.</mixed-citation>
     <mixed-citation xml:lang="en">Leonovich A.S., Mazur V.A. Dynamics of small-scale Alfvén waves in magnetospheric resonator. Fizika plazmy [Plasma Phys.]. 1987, vol. 13, iss. 7, pp. 800-810. (In Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B3">
    <label>3.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Поляков А.Р. Анализ структуры стоячих МГД-волн в магнитосфере методом корреляционных функций флуктуаций амплитуды и фазы. Геомагнетизм и аэрономия. 2014. Т. 54, № 6. С. 752-762. DOI: 10.7868/S0016794014060145.</mixed-citation>
     <mixed-citation xml:lang="en">Leonovich A.S., Mazur V.A. On the spectrum of magnetosonic eigenoscillations of an axisymmetric magnetosphere. J. Geophys. Res. 2001, vol. 106, no. A3, 3919.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B4">
    <label>4.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Поляков А.Р. Связь пиков корреляционных функций флуктуаций амплитуды и фазы и собственных частот в спектре колебаний. Солнечно-земная физика. 2015. Т. 1, № 3. С. 62-71. DOI: 10.12737/10455.</mixed-citation>
     <mixed-citation xml:lang="en">Polyakov A.R. New method of processing records of seismic oscillations based on analysis of correlation functions of random amplitude and phase fluctuations. Parts 1-2. Solnechno-zemnaya fizika [Solar-Terr. Phys.]. 2010, iss. 15, pp. 44-57. (In Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B5">
    <label>5.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Поляков А.Р. Детектирование групп эквидистантных частот в спектрах геомагнитных пульсаций. Солнечно-земная физика. 2018. Т. 4, № 4. С. 43-53. DOI: 10.12737/szf-44201805.</mixed-citation>
     <mixed-citation xml:lang="en">Polyakov A.R. Standing MHD wave structure in the magnetosphere analyzed using the method of correlation functions of amplitude and phase fluctuations. Geomagnetism and Aeronomy. 2014, vol. 54, no. 6, pp. 735-745. DOI: 10.1134/S0016793214060140.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B6">
    <label>6.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Lee D.-H., Lysak R.L. Numerical studies on ULF wave structures in the dipole model, in: Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves. Geophys. Monograph Ser. 1994. Vol. 81. P. 293-297.</mixed-citation>
     <mixed-citation xml:lang="en">Polyakov A.R. Relationship of peaks of correlation functions of amplitude and phase fluctuations with eigenfrequencies in oscillation spectrum. Solnechno-zemnaya fizika [Solar-Terr. Phys.]. 2015, vol. 1, no. 3, pp. 62-71. (In Russian). DOI: 10.12737/10455.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B7">
    <label>7.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Leonovich A.S., Mazur V.A. On the spectrum of magnetosonic eigenoscillations of an axisymmetric magnetosphere. J. Geophys. Res. 2001. Vol.106, no. A3. 3919.</mixed-citation>
     <mixed-citation xml:lang="en">Polyakov A.R. Detecting groups of equidistant frequencies in spectra of geomagnetic pulsations. Solar-Terr. Phys. 2018, vol. 4, iss. 4, pp. 33-41. DOI: 10.12737/stp-44201805.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B8">
    <label>8.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ruohoniemi J.M., Greenwald R.A., Baker K.B. HF radar observations of Pc5 field line resonances in the midnight/early morning MLT sector. J. Geophys. Res. 1991. Vol. 96, iss. A9. P. 15697-15710. DOI: 10.1029/91JA00795.</mixed-citation>
     <mixed-citation xml:lang="en">Ruohoniemi J.M., Greenwald R.A., Baker K.B. HF radar observations of Pc5 field line resonances in the midnight/early morning MLT sector. J. Geophys. Res. 1991, vol. 96, iss. A9, pp. 15697-15710. DOI: 10.1029/91JA00795..</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B9">
    <label>9.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Samson J.C., Harrold B.G. Field line resonances associated with waveguides in the magnetosphere. Geophys. Res. Lett. 1992. Vol. 19, iss. 5. P. 441-444. DOI: 10.1029/92gl00116.</mixed-citation>
     <mixed-citation xml:lang="en">Samson J.C., Harrold B.G. Field line resonances associated with waveguides in the magnetosphere. Geophys. Res. Lett. 1992, vol. 19, iss. 5, pp. 441-444. DOI: 10.1029/92gl00116.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B10">
    <label>10.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Takahashi K., Bonnell J., Glassmeier K.-H., et al. Multipoint observation of fast mode waves trapped in the dayside plasmasphere. J. Geophys. Res. 2010. Vol. 115, iss. A15. A12247. DOI: 10.1029/2010JA015956.</mixed-citation>
     <mixed-citation xml:lang="en">Takahashi K., Bonnell J., Glassmeier K.-H., Angelopoulos V., Singer H.J., Chi P.J., Denton R.E., Nishimura Y., Lee D.-H., Nosé M., Liu W. Multipoint observation of fast mode waves trapped in the dayside plasmasphere. J. Geophys. Res. 2010, vol. 115, iss. A15, A12247. DOI: 10.1029/2010JA015956.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B11">
    <label>11.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Zhu X., Kivelson M.G. Global mode ULF pulsations in a magnetosphere with a nonmonotonic Alfvén velocity profile. J. Geophys. Res. 1989. Vol. 94, iss. A2. P. 1479-1485. DOI: 10.1029/ja094ia02p01479.</mixed-citation>
     <mixed-citation xml:lang="en">Zhu X., Kivelson M.G. Global mode ULF pulsations in a magnetosphere with a nonmonotonic Alfvén velocity profile. J. Geophys. Res. 1989, vol. 94, iss. A2, pp. 1479-1485.DOI: 10.1029/ja094ia02p01479.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B12">
    <label>12.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">URL: http://ckp-rf.ru/ckp/3056 (дата обращения 30 марта 2022 г.).</mixed-citation>
     <mixed-citation xml:lang="en">URL: http://ckp-rf.ru/ckp/3056 (accessed March 30, 2022).</mixed-citation>
    </citation-alternatives>
   </ref>
  </ref-list>
 </back>
</article>
