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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">Informacionnye Tehnologii</journal-id><journal-title-group><journal-title xml:lang="en">Informacionnye Tehnologii</journal-title><trans-title-group xml:lang="ru"><trans-title>Информационные технологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1684-6400</issn><publisher><publisher-name xml:lang="en">New Technologies Publishing House</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">702289</article-id><article-id pub-id-type="doi">10.17587/it.31.191-198</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Modeling and optimization</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Моделирование и оптимизация</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">Removal of outliers in geomagnetic field time series using the Hampel filter</article-title><trans-title-group xml:lang="ru"><trans-title>Удаление выбросов во временных рядах геомагнитного поля на основе фильтра Хампеля</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Imashev</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Имашев</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="KG">Kyrgyzstan</country></address><bio xml:lang="en"><p>Ph.D., Leading Researcher</p></bio><bio xml:lang="ru"><p>канд. физ.-мат. наук, вед. науч. сотр.</p></bio><email>sanzhar.imashev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lazareva</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Лазарева</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="KG">Kyrgyzstan</country></address><bio xml:lang="en"><p>Junior Researcher</p></bio><bio xml:lang="ru"><p>мл. науч. сотр.</p></bio><email>ekaterina.lazareva88@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Station of the Russian Academy of Sciences in Bishkek</institution></aff><aff><institution xml:lang="ru">Научная станция Российской академии наук в г. Бишкеке</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>31</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>191</fpage><lpage>198</lpage><history><date date-type="received" iso-8601-date="2026-02-07"><day>07</day><month>02</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-02-07"><day>07</day><month>02</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Informacionnye Tehnologii</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Информационные технологии</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Informacionnye Tehnologii</copyright-holder><copyright-holder xml:lang="ru">Информационные технологии</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/1684-6400/article/view/702289">https://journals.eco-vector.com/1684-6400/article/view/702289</self-uri><abstract xml:lang="en"><p>The paper presents a methodology for removing outliers in geomagnetic field time series using the Hampel filter. Quality metrics for binary data classification based on the confusion matrix demonstrated the effectiveness of the method and are comparable to those for similar algorithms used for outlier removal in 1-second magnetograms of the international INTERMAGNET network. Outliers identified using the developed methodology for the period 2019-2022 at the Ak-Suu base station exhibit a seasonal distribution pattern that correlates well with thunderstorm activity. The method enhances the quality of preliminary data processing for the geomagnetic monitoring network of the Research Station of the Russian Academy of Sciences, specifically by automating the procedure of magnetograms outliers filtering.</p></abstract><trans-abstract xml:lang="ru"><p>Обсуждается методика удаления выбросов во временных рядах геомагнитного поля с помощью фильтра Хампеля. Метрики качества бинарной классификации данных на основе матрицы ошибок показали эффективность метода и сопоставимы с показателями для аналогичных алгоритмов, применяемых для удаления выбросов в секундных магнитограммах международной сети INTERMAGNET. Выделенные с помощью разработанной методики выбросы за период 2019—2022 гг. по базовой станции Ак-Суу имеют сезонную закономерность распределения, которая хорошо коррелирует с грозовой деятельностью. Метод позволяет повысить качество предварительной обработки данных сети геомагнитного мониторинга Научной станции РАН в части автоматизации процедуры фильтрации выбросов в магнитограммах.</p></trans-abstract><kwd-group xml:lang="en"><kwd>geomagnetic field</kwd><kwd>time series</kwd><kwd>outliers</kwd><kwd>Hampel filter</kwd><kwd>confusion matrix</kwd><kwd>recurrence</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>геомагнитное поле</kwd><kwd>вариационные ряды</kwd><kwd>выбросы</kwd><kwd>фильтр Хампеля</kwd><kwd>матрица ошибок</kwd><kwd>повторяемость</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source><award-id>1021052806454-2-1.5.1</award-id></award-group><funding-statement xml:lang="en">This work was supported by the Federal State Budgetary Institution of Science Research Station Russian Academy of Sciences in Bishkek, project no. 1021052806454-2-1.5.1.</funding-statement><funding-statement xml:lang="ru">Результаты, представленные в данной работе, получены в рамках выполнения государственного задания Федерального государственного бюджетного учреждения науки Научной станции Российской академии наук в г. 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