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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Geomagnetism and Aeronomy</journal-id><journal-title-group><journal-title xml:lang="en">Geomagnetism and Aeronomy</journal-title><trans-title-group xml:lang="ru"><trans-title>Геомагнетизм и аэрономия</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0016-7940</issn><issn publication-format="electronic">3034-5022</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">686203</article-id><article-id pub-id-type="doi">10.31857/S0016794024050128</article-id><article-id pub-id-type="edn">QPOKFB</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ДИСКУССИИ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Comparison of Trends in Various Parameters of the <italic>F</italic>22 Layer</article-title><trans-title-group xml:lang="ru"><trans-title>Сравнение трендов различных параметров слоя <italic>F</italic>2</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Danilov</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Данилов</surname><given-names>А. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>adanilov99@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Konstantinova</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Константинова</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>adanilov99@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Applied Geophysics</institution></aff><aff><institution xml:lang="ru">Институт прикладной геофизики им. акад. Е.К. Фёдорова Росгидромета (ИПГ Росгидромета)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-10-15" publication-format="electronic"><day>15</day><month>10</month><year>2024</year></pub-date><volume>64</volume><issue>5</issue><fpage>723</fpage><lpage>724</lpage><history><date date-type="received" iso-8601-date="2025-06-27"><day>27</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0016-7940/article/view/686203">https://journals.eco-vector.com/0016-7940/article/view/686203</self-uri><abstract xml:lang="en"><p>Estimates of the long-term changes in the ionospheric <italic>F</italic>2-layer parameters (slab thickness, total electron content, height, and maximal electron concentration) are presented and mutually compared. It is shown that these estimates mutually agree and show that both <italic>foF</italic>2 and <italic>hmF</italic>2 are decreasing during the recent decades.</p></abstract><trans-abstract xml:lang="ru"><p>Приводятся и сравниваются между собой оценки долговременных изменений параметров ионосферного слоя <italic>F</italic>2: приведенная толщина, полное содержание электронов, высота и максимальная концентрация. Показано, что эти оценки согласуются между собой и показывают, что и <italic>foF</italic>2, и <italic>hmF</italic>2 уменьшаются в последние десятилетия.</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Данилов А.Д., Константинова А.В. Долговременные вариации параметров средней и верхней атмосферы и ионосферы (обзор) // Геомагнетизм и аэрономия. Т. 60. № 4. 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