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      <journal>
        <journal_metadata language="en" reference_distribution_opts="any">
          <full_title>Annales Geophysicae</full_title>
          <abbrev_title>Ann. Geophys.</abbrev_title>
          <issn media_type="electronic">1432-0576</issn>
        </journal_metadata>
        <journal_issue>
          <publication_date media_type="online">
            <year>2015</year>
          </publication_date>
          <journal_volume>
            <volume>33</volume>
          </journal_volume>
          <issue>2</issue>
        </journal_issue>
        <journal_article publication_type="full_text">
          <titles>
            <title>Relation between stratospheric sudden warming and the lunar effect on the equatorial electrojet based on Huancayo recordings</title>
          </titles>
          <contributors>
            <person_name sequence="first" contributor_role="author">
              <given_name>T. A.</given_name>
              <surname>Siddiqui</surname>
              <ORCID>https://orcid.org/0000-0001-9394-6708</ORCID>
            </person_name>
            <person_name sequence="additional" contributor_role="author">
              <given_name>H.</given_name>
              <surname>Lühr</surname>
              <ORCID>https://orcid.org/0000-0002-1599-6758</ORCID>
            </person_name>
            <person_name sequence="additional" contributor_role="author">
              <given_name>C.</given_name>
              <surname>Stolle</surname>
              <ORCID>https://orcid.org/0000-0002-5717-1623</ORCID>
            </person_name>
            <person_name sequence="additional" contributor_role="author">
              <given_name>J.</given_name>
              <surname>Park</surname>
            </person_name>
          </contributors>
          <abstract>
            <p><![CDATA[Abstract. It has been known for many decades that the lunar tidal influence in the equatorial electrojet (EEJ) is noticeably enhanced during Northern Hemisphere winters. Recent literature has discussed the role of stratospheric sudden warming (SSW) events behind the enhancement of lunar tides and the findings suggest a positive correlation between the lunar tidal amplitude and lower stratospheric parameters (zonal mean air temperature and zonal mean zonal wind) during SSW events. The positive correlation raises the question whether an inverse approach could also be developed which makes it possible to deduce the occurrence of SSW events before their direct observations (before 1952) from the amplitude of the lunar tides. This study presents an analysis technique based on the phase of the semi-monthly lunar tide to determine the lunar tidal modulation of the EEJ. A statistical approach using the superposed epoch analysis is also carried out to formulate a relation between the EEJ tidal amplitude and lower stratospheric parameters. Using these results, we have estimated a threshold value for the tidal wave power that could be used to identify years with SSW events from magnetic field observations.]]></p>
          </abstract>
          <publication_date media_type="online">
            <month>02</month>
            <day>26</day>
            <year>2015</year>
          </publication_date>
          <pages>
            <first_page>235</first_page>
            <last_page>243</last_page>
          </pages>
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            <free_to_read start_date="2015-02-26" />
            <license_ref applies_to="vor" start_date="2015-02-26">https://creativecommons.org/licenses/by/3.0/</license_ref>
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          <doi_data>
            <doi>10.5194/angeo-33-235-2015</doi>
            <resource>https://angeo.copernicus.org/articles/33/235/2015/</resource>
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                <resource>https://angeo.copernicus.org/articles/33/235/2015/angeo-33-235-2015.pdf</resource>
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