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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Solar-Terrestrial Physics</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Solar-Terrestrial Physics</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Солнечно-земная физика / Solnechno-Zemnaya Fizika / Solar-Terrestrial Physics</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">69839</article-id>
   <article-id pub-id-type="doi">10.12737/szf-94202305</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">Dynamics of small-scale magnetic fields before small and large solar flares</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Динамика мелкомасштабных магнитных полей перед малыми и крупными солнечными вспышками</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/0000-0001-5725-8262</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Боровик</surname>
       <given-names>Александр Васильевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Borovik</surname>
       <given-names>Aleksandr Vasil'evich</given-names>
      </name>
     </name-alternatives>
     <email>aborovik@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 contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9563-1360</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Жданов</surname>
       <given-names>Антон Андреевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Zhdanov</surname>
       <given-names>Anton Andreevich</given-names>
      </name>
     </name-alternatives>
     <email>kick.out@mail.ru</email>
     <xref ref-type="aff" rid="aff-2"/>
    </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>
   <aff-alternatives id="aff-2">
    <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="2023-12-20T13:18:19+03:00">
    <day>20</day>
    <month>12</month>
    <year>2023</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2023-12-20T13:18:19+03:00">
    <day>20</day>
    <month>12</month>
    <year>2023</year>
   </pub-date>
   <volume>9</volume>
   <issue>4</issue>
   <fpage>44</fpage>
   <lpage>53</lpage>
   <history>
    <date date-type="received" iso-8601-date="2023-09-02T00:00:00+03:00">
     <day>02</day>
     <month>09</month>
     <year>2023</year>
    </date>
    <date date-type="accepted" iso-8601-date="2023-11-09T00:00:00+03:00">
     <day>09</day>
     <month>11</month>
     <year>2023</year>
    </date>
   </history>
   <self-uri xlink:href="https://zh-szf.ru/en/nauka/article/69839/view">https://zh-szf.ru/en/nauka/article/69839/view</self-uri>
   <abstract xml:lang="ru">
    <p>По данным наблюдений SDO (Solar Dynamics Observatory) исследовалась динамика продольного магнитного поля активной области (АО) NOAA 12673. За время прохождения АО по диску Солнца пятна и фоновые поля в ней показывали сложные траектории движения, при этом наблюдалось образование многочисленных короткоживущих локальных мелкомасштабных линий раздела полярностей (ЛЛРП), которые формировались при появлении в АО новых магнитных потоков и их сближении с полями противоположной полярности. Протяженность таких ЛЛРП составляла менее 15000 км (~20 угл. сек), время существования — несколько часов. Исследование вспышечной активности NOAA 12673 показало, что вспышки малой мощности (оптический класс S, площадь ˂2 кв. град) обычно происходят вблизи ЛЛРП. Перед малыми вспышками, а также перед крупной вспышкой 06.09.2017 (оптический балл 3В, рентгеновский класс Х9.3) на ограниченных участках локальных и главной ЛРП АО наблюдались сдвиговые напряжения магнитного поля и рост gradН: в области вспышек малой мощности — до значений 1.3–1.5 Гс/км, в области крупной вспышки — 3–3.5 Гс/км. Полученные результаты свидетельствуют о том, что перед малыми и крупными вспышками продольное магнитное поле ведет себя аналогичным образом.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>We have examined the dynamics of the longitudinal magnetic field of active region NOAA 12673, using data from the Solar Dynamics Observatory (SDO). During the passage of the active region (AR) across the solar disk, its spots and background fields showed complex motion trajectories, and numerous small-scale short-lived local polarity inversion lines (LPILs) were formed when new magnetic fluxes appeared in the AR and came closer to fields of opposite polarity. The length of LPILs was less than 15.000 km (~20 arcsec); their lifetime was several hours. Study of the flare activity of NOAA 12673 has shown that low-power flares (optical class S, area ˂2 sq. degrees) generally occur near LPILs. Before small flares and the September 06, 2017 large flare (optical importance 3B, X-ray class X9.3), in limited sites of local and main polarity inversion lines there were shear stresses and an increase in the magnetic field gradient: in the region of low-power flares, to 1.3–1.5 G/km; in the region of the large flare, 3–3.5 G/km. The results obtained suggest that the longitudinal magnetic field behaves similarly before both small and large flares.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>вспышки</kwd>
    <kwd>магнитное поле</kwd>
    <kwd>линии раздела полярности</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>flares</kwd>
    <kwd>magnetic fields</kwd>
    <kwd>polarity inversion lines</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Работа выполнена в рамках базового финансирования программы ФНИ II.16</funding-statement>
    <funding-statement xml:lang="en">The work was financially supported by Basic Research Program II.16</funding-statement>
   </funding-group>
  </article-meta>
 </front>
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