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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">81081</article-id>
   <article-id pub-id-type="doi">10.12737/szf-103202406</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>ДЕВЯТНАДЦАТАЯ ЕЖЕГОДНАЯ КОНФЕРЕНЦИЯ «ФИЗИКА ПЛАЗМЫ В СОЛНЕЧНОЙ СИСТЕМЕ», 5–9 ФЕВРАЛЯ 2024 Г., ИНСТИТУТ КОСМИЧЕСКИХ ИССЛЕДОВАНИЙ РАН, МОСКВА, РОССИЯ</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA</subject>
    </subj-group>
    <subj-group>
     <subject>ДЕВЯТНАДЦАТАЯ ЕЖЕГОДНАЯ КОНФЕРЕНЦИЯ «ФИЗИКА ПЛАЗМЫ В СОЛНЕЧНОЙ СИСТЕМЕ», 5–9 ФЕВРАЛЯ 2024 Г., ИНСТИТУТ КОСМИЧЕСКИХ ИССЛЕДОВАНИЙ РАН, МОСКВА, РОССИЯ</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">MHD waves at the pre-front of interplanetary shocks on September 6 and 7, 2017</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>МГД-волны в области предфронта межпланетных ударных волн 6 и 7 сентября 2017 г.</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2343-1618</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Стародубцев</surname>
       <given-names>Сергей Анатольевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Starodubtsev</surname>
       <given-names>Sergei Anatolyevich</given-names>
      </name>
     </name-alternatives>
     <email>starodub@ikfia.ysn.ru</email>
     <bio xml:lang="ru">
      <p>доктор физико-математических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>doctor of physical and mathematical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Шадрина</surname>
       <given-names>Людмила Панкратьевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Shadrina</surname>
       <given-names>Lyudmila Pankratevna</given-names>
      </name>
     </name-alternatives>
     <email>lushadr@mail.ru</email>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН</institution>
     <city>Якутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS</institution>
     <city>Yakutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Академия наук Республики Саха</institution>
     <city>Якутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Academy of Sciences of the Republic of Sakha</institution>
     <city>Yakutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2024-09-29T09:14:37+03:00">
    <day>29</day>
    <month>09</month>
    <year>2024</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2024-09-29T09:14:37+03:00">
    <day>29</day>
    <month>09</month>
    <year>2024</year>
   </pub-date>
   <volume>10</volume>
   <issue>3</issue>
   <fpage>53</fpage>
   <lpage>61</lpage>
   <history>
    <date date-type="received" iso-8601-date="2024-03-30T00:00:00+03:00">
     <day>30</day>
     <month>03</month>
     <year>2024</year>
    </date>
    <date date-type="accepted" iso-8601-date="2024-08-02T00:00:00+03:00">
     <day>02</day>
     <month>08</month>
     <year>2024</year>
    </date>
   </history>
   <self-uri xlink:href="https://naukaru.ru/en/nauka/article/81081/view">https://naukaru.ru/en/nauka/article/81081/view</self-uri>
   <abstract xml:lang="ru">
    <p>В работе анализируются события сильных возмущений космической погоды в первой декаде сентября 2017 г. При этом используется данные Dst-индекса геомагнитной активности, параметров нормалей к фронтам межпланетных ударных волн, а также прямые измерения параметров межпланетного магнитного поля, плазмы солнечного ветра и космических лучей. С использованием спектрального анализа данных измерений параметров межпланетной среды проведен анализ МГД-волн в области предфронта двух межпланетных ударных волн, ответственных за геомагнитные возмущения 6 и 7 сентября 2017 г. Основные полученные результаты сводятся к следующему: установлен вклад трех веток МГД-волн (альфвеновских, быстрых и медленных магнитозвуковых) в наблюдаемый спектр модуля межпланетного магнитного поля. Подтвержден вывод, что генерация альфвеновских и быстрых магнитозвуковых волн обусловлена наличием потоков протонов с энергией Ep~1 МэВ в области предфронта межпланетных ударных волн. При этом обнаружен преобладающий вклад медленных магнитозвуковых волн в наблюдаемый спектр модуля межпланетного магнитного поля, но причина этого остается неизвестной. Отмечается, что разная ориентация нормалей между фронтами межпланетных ударных волн и направлением среднего вектора межпланетного магнитного поля на достаточно близко расположенных относительно друг друга космических аппаратах может служить признаком волнистости структуры фронта ударной волны.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>We analyze strong space weather disturbances during first ten days of September 2017, using the geomagnetic Dst index, parameters of normals to interplanetary shock fronts, direct measurements of interplanetary magnetic field, solar wind, and cosmic ray parameters. By applying spectral analysis methods to interplanetary medium data, we analyze MHD waves at the pre-front of two interplanetary shocks responsible for geomagnetic disturbances on September 6 and 7, 2017. The main results are as follows: the contribution of three branches of MHD waves (Alfvén, fast and slow magnetosonic) to the observed spectrum of the interplanetary magnetic field modulus has been established. We have confirmed the conclusion that the generation of Alfvén waves and fast magnetosonic waves is due to the presence of low-energy proton fluxes (Ep~1 MeV) at the pre-front of interplanetary shocks. We have also discovered a predominant contribution of slow magnetosonic waves to the observed spectrum of the interplanetary magnetic field modulus, but its reason is yet unknown. It is noted that different orientations of the normals to the interplanetary shock fronts and to the direction of the interplanetary magnetic field average vector on spacecraft located fairly close to each other may indicate waviness of the shock front structure.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>межпланетное магнитное поле</kwd>
    <kwd>солнечный ветер</kwd>
    <kwd>МГД-волны</kwd>
    <kwd>межпланетная ударная волна</kwd>
    <kwd>геомагнитная буря</kwd>
    <kwd>космические лучи</kwd>
    <kwd>форбуш-понижение</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>interplanetary magnetic field</kwd>
    <kwd>solar wind</kwd>
    <kwd>MHD waves</kwd>
    <kwd>interplanetary shock</kwd>
    <kwd>geomagnetic storm</kwd>
    <kwd>cosmic rays</kwd>
    <kwd>Forbush decrease</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Минобрнауки РФ для ИКФИА СО РАН (FWRS-2021-0012) и государственного задания АН РС (Я) (приказ Минобрнауки РС(Я) № 01-03/32 от 01.01. 2023)</funding-statement>
    <funding-statement xml:lang="en">The work was performed under Government assignment of the Ministry of Science and Higher Education of the Russian Federation for SHICRA SB RAS (FWRS-2021-0012) and Government assignment of AN RS (Ya) (Order of the Ministry of Science and Higher Education RS(Ya) No. 01-03/32 dated January 01, 2023)</funding-statement>
   </funding-group>
  </article-meta>
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