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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">75782</article-id>
   <article-id pub-id-type="doi">10.12737/szf-102202404</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">Variability of ionospheric ionization over Eurasia according to data from a high-latitude ionosonde chain during extreme magnetic storms in 2015</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Изменчивость ионизации ионосферы над Евразией по данным цепи высокоширотных ионозондов во время экстремальных магнитных бурь 2015 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/0000-0002-8927-5814</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Черниговская</surname>
       <given-names>Марина Артуровна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Chernigovskaya</surname>
       <given-names>Marina Arturovna</given-names>
      </name>
     </name-alternatives>
     <email>cher@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">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Сетов</surname>
       <given-names>Артём Геннадьевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Setov</surname>
       <given-names>Artem Gennadyevich</given-names>
      </name>
     </name-alternatives>
     <email>artemsetov@gmail.com</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-2"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0847-3553</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Ратовский</surname>
       <given-names>Константин Геннадьевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Ratovsky</surname>
       <given-names>Konstantin Gennadyevich</given-names>
      </name>
     </name-alternatives>
     <email>ratovsky@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-3"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7299-6546</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Калишин</surname>
       <given-names>Алексей Сергеевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Kalishin</surname>
       <given-names>Alexey Sergeevich</given-names>
      </name>
     </name-alternatives>
     <email>askalishin@aari.ru</email>
     <bio xml:lang="ru">
      <p>кандидат технических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>candidate of technical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-4"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Степанов</surname>
       <given-names>Александр Егорович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Stepanov</surname>
       <given-names>Aleksandr Egorovich</given-names>
      </name>
     </name-alternatives>
     <email>a_e_stepanov@ikfia.ysn.ru</email>
     <xref ref-type="aff" rid="aff-5"/>
    </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>
   <aff-alternatives id="aff-3">
    <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-4">
    <aff>
     <institution xml:lang="ru">Арктический и антарктический научно-исследовательский институт</institution>
     <city>Санкт-Петербург</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Arctic and Antarctic Research Institute</institution>
     <city>St. Petersburg</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-5">
    <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>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2024-06-25T00:00:00+03:00">
    <day>25</day>
    <month>06</month>
    <year>2024</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2024-06-25T00:00:00+03:00">
    <day>25</day>
    <month>06</month>
    <year>2024</year>
   </pub-date>
   <volume>10</volume>
   <issue>2</issue>
   <fpage>38</fpage>
   <lpage>52</lpage>
   <history>
    <date date-type="received" iso-8601-date="2024-03-07T00:00:00+03:00">
     <day>07</day>
     <month>03</month>
     <year>2024</year>
    </date>
    <date date-type="accepted" iso-8601-date="2024-04-16T00:00:00+03:00">
     <day>16</day>
     <month>04</month>
     <year>2024</year>
    </date>
   </history>
   <self-uri xlink:href="https://naukaru.ru/en/nauka/article/75782/view">https://naukaru.ru/en/nauka/article/75782/view</self-uri>
   <abstract xml:lang="ru">
    <p>Проанализированы долготно-временные вариации параметров ионосферы над Евразийским континентом на основе анализа данных цепи высокоширотных ионозондов вдоль широтного круга ~70° N (геомагнитные широты 58* Glat65* ) в долготном секторе 26°–171° E во время экстремальных магнитных бурь 24-го цикла солнечной активности в марте и июне 2015 г. Для анализа отклика ионизации ионосферы на геомагнитные возмущения использовались данные ионозондов о среднечасовых значениях критической частоты foF2 слоя F2 ионосферы. Отмечены большие различия в общих особенностях временных вариаций foF2 для анализируемых периодов магнитных бурь, которые, вероятно, связаны с характерными особенностями сезонного и суточного хода фоновой высокоширотной ионосферы данного географического региона. На главных и ранних восстановительных фазах магнитных бурь наблюдались периоды блэкаутов радиосигналов ионозондов. Отмечены различия в характере реакции ионосферы на геомагнитные возмущения, связанные, по всей видимости, с сезонными особенностями вероятности возникновения положительной или отрицательной фазы ионосферной бури в разные сезоны года. Тенденция повышения ионизации ионосферы над обширным регионом Восточной, Западной Сибири и Европы после завершения экстремальной магнитной бури в марте 2015 г. по данным измерений цепи высокоширотных ионозондов может быть связана с образованием над этой территорией области повышенного отношения [O]/[N₂]. Подобный рост ионизации ионосферы с превышением значений foF2 относительно фона можно рассматривать как яркое проявление эффекта последействия магнитных бурь.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>. We have examined longitudinal-temporal variations in ionospheric parameters over Eurasia by analyzing data from a chain of high-latitude ionosondes along a latitude circle ~70° N (geomagnetic latitudes 58°&lt;Glat&lt;65°) in the longitudinal sector 26–171° E during severe magnetic storms of solar cycle 24 in March and June 2015. To analyze the response of ionospheric ionization to geomagnetic disturbances, we have used ionosonde data on hourly average critical frequency foF2 of the ionospheric F2 layer. Strong differences were observed between common peculiarities of temporal variations in foF2 for the analyzed periods of magnetic storms, which are likely associated with the characteristic features of the seasonal and diurnal variations in the background high-latitude ionosphere of the given geographic region. During the main and early recovery phases of magnetic storms there were periods of blackouts of ionosonde radio signals. Differences in the character of the ionospheric response to geomagnetic disturbances have been noted. This is probably due to seasonal features of the probability of occurrence of the ionospheric storm positive or negative phase in different seasons of the year. The trends of increasing ionospheric ionization over the vast region of Eastern, Western Siberia and Europe after the end of the extreme magnetic storm in March 2015, according to measurements from the chain of high-latitude ionosondes, may be associated with the formation of an area of increased [O]/[N₂] ratio over this territory. Such an increase in ionospheric ionization exceeding the background level of foF2 values can be considered as a clear manifestation of the after-effect of magnetic storms.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>высокоширотная ионосфера</kwd>
    <kwd>цепь ионозондов</kwd>
    <kwd>геомагнитная буря</kwd>
    <kwd>вариации ионизации ионосферы</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>high-latitude ionosphere; ionosonde chain</kwd>
    <kwd>geomagnetic storm</kwd>
    <kwd>variations of ionospheric ionization</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Проекта РНФ № 23-27-00322</funding-statement>
    <funding-statement xml:lang="en">The work was financially supported by RSF (Project No. 23-27-00322)</funding-statement>
   </funding-group>
  </article-meta>
 </front>
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