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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>Solar-Terrestrial Physics</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="online">2500-0535</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">12007</article-id>
   <article-id pub-id-type="doi">10.12737/19856</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>Results of current research</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>Results of current research</subject>
    </subj-group>
    <subj-group>
     <subject>Results of current research</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">The reversal of the Sun’s magnetic field in cycle 24</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>The reversal of the Sun’s magnetic field in cycle 24</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Мордвинов</surname>
       <given-names>Александр Вениаминович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Mordvinov</surname>
       <given-names>Aleksandr Veniaminovich</given-names>
      </name>
     </name-alternatives>
     <email>avm@iszf.irk.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>Певцов</surname>
       <given-names>Алексей A.</given-names>
      </name>
      <name xml:lang="en">
       <surname>Pevtsov</surname>
       <given-names>Aleksey A.</given-names>
      </name>
     </name-alternatives>
     <email>pevtsov@noao.edu</email>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Бертелло</surname>
       <given-names>Лука </given-names>
      </name>
      <name xml:lang="en">
       <surname>Bertello</surname>
       <given-names>Luka </given-names>
      </name>
     </name-alternatives>
     <email>lbertello@nso.edu</email>
     <xref ref-type="aff" rid="aff-3"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Петри</surname>
       <given-names>Гордон </given-names>
      </name>
      <name xml:lang="en">
       <surname>Petri</surname>
       <given-names>Gordon </given-names>
      </name>
     </name-alternatives>
     <email>gpetrie@noao.edu</email>
     <xref ref-type="aff" rid="aff-4"/>
    </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">Национальная солнечная обсерватория США</institution>
     <city>Санспот</city>
     <country>США</country>
    </aff>
    <aff>
     <institution xml:lang="en">National Solar Observatory</institution>
     <city>Sunspot</city>
     <country>United States of America</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Национальная солнечная обсерватория США</institution>
     <city>Санспот</city>
     <country>США</country>
    </aff>
    <aff>
     <institution xml:lang="en">National Solar Observatory</institution>
     <city>Sunspot</city>
     <country>United States of America</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-4">
    <aff>
     <institution xml:lang="ru">Национальная солнечная обсерватория США</institution>
     <city>Санспот</city>
     <country>США</country>
    </aff>
    <aff>
     <institution xml:lang="en">National Solar Observatory</institution>
     <city>Sunspot</city>
     <country>United States of America</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2016-05-30T00:00:00+03:00">
    <day>30</day>
    <month>05</month>
    <year>2016</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2016-05-30T00:00:00+03:00">
    <day>30</day>
    <month>05</month>
    <year>2016</year>
   </pub-date>
   <volume>2</volume>
   <issue>1</issue>
   <fpage>3</fpage>
   <lpage>18</lpage>
   <self-uri xlink:href="https://zh-szf.ru/en/nauka/article/12007/view">https://zh-szf.ru/en/nauka/article/12007/view</self-uri>
   <abstract xml:lang="ru">
    <p>Analysis of synoptic data from the Vector Spectromagnetograph (VSM) of the Synoptic Optical Long-term Investigations of the Sun (SOLIS) and the NASA/NSO Spectromagnetograph (SPM) at the NSO/Kitt Peak Vacuum Telescope facility shows that the reversals of solar polar magnetic fields exhibit elements of a stochastic process, which may include the development of specific patterns of emerging magnetic flux, and the asymmetry in activity between Northern and Southern hemispheres. The presence of such irregularities makes the modeling and prediction of polar field reversals extremely hard if possible. In a classical model of solar activity cycle, the unipolar magnetic regions (UMRs) of predominantly following polarity fields are transported polewards due to meridional flows and diffusion. The UMRs gradually cancel out the polar magnetic field of the previous cycle, and rebuild the polar field of opposite polarity setting the stage for the next cycle. We show, however, that this deterministic picture can be easily altered by the developing of a strong center of activity, or by the emergence of an extremely large active region, or by a ‘strategically placed’ coronal hole. We demonstrate that the activity occurring during the current cycle 24 may be the result of this randomness in the evolution of the solar surface magnetic field.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Analysis of synoptic data from the Vector Spectromagnetograph (VSM) of the Synoptic Optical Long-term Investigations of the Sun (SOLIS) and the NASA/NSO Spectromagnetograph (SPM) at the NSO/Kitt Peak Vacuum Telescope facility shows that the reversals of solar polar magnetic fields exhibit elements of a stochastic process, which may include the development of specific patterns of emerging magnetic flux, and the asymmetry in activity between Northern and Southern hemispheres. The presence of such irregularities makes the modeling and prediction of polar field reversals extremely hard if possible. In a classical model of solar activity cycle, the unipolar magnetic regions (UMRs) of predominantly following polarity fields are transported polewards due to meridional flows and diffusion. The UMRs gradually cancel out the polar magnetic field of the previous cycle, and rebuild the polar field of opposite polarity setting the stage for the next cycle. We show, however, that this deterministic picture can be easily altered by the developing of a strong center of activity, or by the emergence of an extremely large active region, or by a ‘strategically placed’ coronal hole. We demonstrate that the activity occurring during the current cycle 24 may be the result of this randomness in the evolution of the solar surface magnetic field.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>Solar cycle</kwd>
    <kwd>sunspot activity</kwd>
    <kwd>magnetic fields</kwd>
    <kwd>coronal holes</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>Solar cycle</kwd>
    <kwd>sunspot activity</kwd>
    <kwd>magnetic fields</kwd>
    <kwd>coronal holes</kwd>
   </kwd-group>
  </article-meta>
 </front>
 <body>
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