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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">33523</article-id>
   <article-id pub-id-type="doi">10.12737/szf-63202006</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">Ultra low frequency emissions ranging from 0.1 to 3 Hz in circumpolar areas</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Ультранизкочастотные эмиссии диапазона 0.1–3 Гц в приполярных областях</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/0000-0002-4864-0993</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Потапов</surname>
       <given-names>Александр Сергеевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Potapov</surname>
       <given-names>Alexander Sergeevich</given-names>
      </name>
     </name-alternatives>
     <email>potapov@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>Гульельми</surname>
       <given-names>Анатолий Владимирович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Guglielmi</surname>
       <given-names>Anatol Vladimirovich</given-names>
      </name>
     </name-alternatives>
     <email>guglielmi@mail.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-2"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Довбня</surname>
       <given-names>Борис Викторович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Dovbnya</surname>
       <given-names>Boris Viktorovich</given-names>
      </name>
     </name-alternatives>
     <email>dovbnya@inbox.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-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 физики Земли им. О.Ю. Шмидта РАН</institution>
     <city>Москва</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Schmidt Institute of Physics of the Earth, RAS</institution>
     <city>Moscow</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Геофизическая обсерватория «Борок» ИФЗ РАН</institution>
     <city>Борок</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Borok Geophysical Observatory of IPE RAS</institution>
     <city>Borok</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <volume>6</volume>
   <issue>3</issue>
   <fpage>48</fpage>
   <lpage>55</lpage>
   <self-uri xlink:href="https://naukaru.ru/en/nauka/article/33523/view">https://naukaru.ru/en/nauka/article/33523/view</self-uri>
   <abstract xml:lang="ru">
    <p>Рассмотрены характеристики двух типов излучений в высокочастотной части УНЧ-диапа-зона (0.1–3 Гц) — серпентинной эмиссии (SE) и дискретных диспергированных сигналов (DS). Они наблюдаются в полярных шапках с помощью индукционных магнитометров. Поскольку в настоящее время эти инструменты в высоких широтах практически отсутствуют, анализ проведен на основе записей 1968–1971 гг., полученных на близких к геомагнитным полюсам ст. «Восток» и «Туле». Показано, что появление DS жестко привязано к магнитной силовой линии, проходящей через станцию наблюдения, с острым пиком частоты появления в местный магнитный полдень. В то же время сезонный ход частоты появления DS имеет основной пик местным летом и дополнительный — местной зимой. С учетом полученного нами ранее результата о возбуждении, по крайней мере, части DS в области форшока, можно предположить, что падающие на магнитопаузу волновые пакеты проникают на внешние силовые линии преимущественно в околополуденной области и распространяются вдоль этих линий в обе стороны, попадая в конце концов на поверхность земли в приполярных областях. В отличие от DS частота появления SE не имеет ни суточного, ни сезонного хода. Мы проверили и косвенно подтвердили выдвинутую ранее гипотезу о возбуждении SE циклотронной неустойчивостью протонов в солнечном ветре, промоделировав вариации частоты ионно-циклотронных волн при разных уровнях возмущенности межпланетной плазмы и сравнив результаты с наблюдавшимися в сходных условиях вариациями частоты SE. Сделан вывод о необходимости возобновления непрерывных наблюдений УНЧ-излучений с помощью индукционных магнитометров, установленных в полярных шапках вблизи проекций каспов и около геомагнитных полюсов.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>We examine the characteristics of oscillations of two types in the high-frequency edge of the ULF range (0.1–3 Hz), serpentine emission (SE), and discrete frequency dispersed signals (DS). Oscillations of both the types are observed in the polar caps exclusively with induction magnetometers. Since these instruments are currently practically absent at high latitudes, the analysis has been carried out from records obtained at the stations Vostok and Thule close to the geomagnetic poles in 1968–1971. The DS occurrence rate is shown to have a sharp peak at local magnetic noon. This fact indicates that DS emergence is rigidly tied to the geomagnetic field line passing through the observation station. At the same time, the seasonal variation in the frequency of DS occurrence has a main peak in local summer and an additional peak in local winter. We have revealed before that at least a part of DS is excited in the foreshock region. Taking this into account, we can assume that the wave packets incident to the magnetopause fall on the external field lines mainly in the noon region and propagate along these lines in both directions, eventually reaching Earth’s surface in the polar regions. Unlike DS, the SE occurrence rate has neither a daily nor a seasonal variation. We have tested and confirmed indirectly the hypothesis put forward earlier about the excitation of SE by cyclotron instability of protons in the solar wind, simulating frequency variations in ion-cyclotron waves at different levels of interplanetary plasma perturbation and comparing the results with the SE frequency variations observed under similar conditions. We conclude that it is necessary to resume continuous observations of ULF emissions, using induction magnetometers installed in polar caps near the projections of cusps and near geomagnetic poles.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>ультранизкочастотные электромагнитные волны</kwd>
    <kwd>полярные шапки</kwd>
    <kwd>касп</kwd>
    <kwd>магнитосфера</kwd>
    <kwd>солнечный ветер</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>ultra low frequency electromagnetic waves</kwd>
    <kwd>polar caps</kwd>
    <kwd>cusp</kwd>
    <kwd>magnetosphere</kwd>
    <kwd>solar wind</kwd>
   </kwd-group>
  </article-meta>
 </front>
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