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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</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">104611</article-id>
   <article-id pub-id-type="doi">10.12737/szf-122202605</article-id>
   <article-id pub-id-type="edn">nddtca</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">Seasonal variations in daily maximum of electron density in the F2 ionospheric layer depending on solar activity according to the Tomsk ionospheric station data</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Сезонные вариации дневного максимума электронной концентрации слоя F2 ионосферы в зависимости от солнечной активности по данным Томской ионосферной станции</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Колесник</surname>
       <given-names>Сергей Анатольевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Kolesnik</surname>
       <given-names>Sergey Anatol'evich</given-names>
      </name>
     </name-alternatives>
     <email>serkol@mail.tsu.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Борисевич</surname>
       <given-names>Алексей Николаевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Borisevich</surname>
       <given-names>Alexei Nikolaevich</given-names>
      </name>
     </name-alternatives>
     <email>aborisevich77@gmail.com</email>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Томский государственный университет</institution>
    </aff>
    <aff>
     <institution xml:lang="en">Tomsk State University</institution>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">ФИЦ «Красноярский научный центр СО РАН»</institution>
     <city>Красноярск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Federal Research Center “Krasnoyarsk Science Center SB RAS”</institution>
     <city>Krasnoyarsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <volume>12</volume>
   <issue>2</issue>
   <fpage>47</fpage>
   <lpage>53</lpage>
   <history>
    <date date-type="received" iso-8601-date="2025-09-25T00:00:00+03:00">
     <day>25</day>
     <month>09</month>
     <year>2025</year>
    </date>
    <date date-type="accepted" iso-8601-date="2025-12-22T00:00:00+03:00">
     <day>22</day>
     <month>12</month>
     <year>2025</year>
    </date>
   </history>
   <self-uri xlink:href="https://naukaru.ru/en/nauka/article/104611/view">https://naukaru.ru/en/nauka/article/104611/view</self-uri>
   <abstract xml:lang="ru">
    <p>В работе проведен анализ вариаций максимума электронной концентрации NmF2 слоя F2 ионосферы по данным Томской ионосферной станции с 1947 по 2024 г. Этот период включает восемь 11-летних циклов солнечной активности; цель проведенного анализа — выявление сезонных изменений дневных максимумов NmF2 в среднеширотной ионосфере и их связь с солнечной активностью. Построены сезонно-суточные вариации NmF2 отдельно для низких и высоких уровней солнечной активности. Для каждого месяца года рассчитаны линейные и квадратичные модели регрессионной зависимости дневных максимумов NmF2 от индекса F10.7. Вычислены регрессионные модели для месячных медиан и ежесуточных значений дневных максимумов NmF2. Приведены количественные сравнения и факторы ограничений этих моделей для разного типа агрегации данных.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>The paper analyzes variations in the maximum electron density of the F2 ionospheric layer (NmF2), using data from the Tomsk ionospheric station for the period from 1947 to 2024, including seven 11-year solar cycles, with the aim of identifying seasonal changes in daily NmF2 maxima in the mid-latitude ionosphere and their relationship with solar activity. Seasonal-daily variations of NmF2 were constructed separately for low and high solar activity levels. Linear and quadratic models of the regression dependence of the NmF2 daily values on the F10.7 index are calculated for each month of the year. Regression models are computed for both monthly medians and daily data. Quantitative comparisons and resistance factors of different models for different types of data aggregation are given.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>солнечная активность</kwd>
    <kwd>ионосферный слой F2</kwd>
    <kwd>регрессионные модели</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>solar activity</kwd>
    <kwd>F2 layer</kwd>
    <kwd>regression models</kwd>
   </kwd-group>
  </article-meta>
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