Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 39951 10.12737/stp-72202108 Results of current research Results of current research Results of current research Signs of anomalous behavior of the ionosphere in 2003–2014 at F1-layer heights over Irkutsk Signs of anomalous behavior of the ionosphere in 2003–2014 at F1-layer heights over Irkutsk Кушнаренко Галина Петровна Kushnarenko Galina Petrovna kusch@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Яковлева Ольга Евгеньевна Yakovleva Olga Evgenyevna yakovleva@iszf.ru Кузнецова Галина Михайловна Kuznetsova Galina Mihaylovna kuz@iszf.irk.ru Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 7 2 74 80 19 10 2020 17 05 2021 https://naukaru.ru/en/nauka/article/39951/view

We have detected an anomalous electron density Ne increase in winter months in Irkutsk in some years of the period 2003–2014. This effect was manifested when we compared the experimental values obtained by the Irkutsk ionosonde with model calculations at F1-layer heights (120–200 km). Two anomalous time zones have been found. The first was observed in the period 2003–2006 near solar minimum. In this zone, 2003 is the year of maximum manifestation of the winter Ne increase over the entire research period. The second anomalous zone — 2012, 2013, 2014 — was detected during solar maximum. We have explored possible causes of the Ne change in winter at the F1-layer heights in all the years under study. We have found that the main factor causing the winter increase in Ne is significant geomagnetic disturbances in the above time periods.

We have detected an anomalous electron density Ne increase in winter months in Irkutsk in some years of the period 2003–2014. This effect was manifested when we compared the experimental values obtained by the Irkutsk ionosonde with model calculations at F1-layer heights (120–200 km). Two anomalous time zones have been found. The first was observed in the period 2003–2006 near solar minimum. In this zone, 2003 is the year of maximum manifestation of the winter Ne increase over the entire research period. The second anomalous zone — 2012, 2013, 2014 — was detected during solar maximum. We have explored possible causes of the Ne change in winter at the F1-layer heights in all the years under study. We have found that the main factor causing the winter increase in Ne is significant geomagnetic disturbances in the above time periods.

 electron density winter increase in Ne geomagnetic activity electron density winter increase in Ne geomagnetic activity The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (project "Study of the State and Dynamics of Earth's Atmosphere at Different Time Scales under the Influence of Geophysical, Cosmic, and Human Impacts") The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (project "Study of the State and Dynamics of Earth's Atmosphere at Different Time Scales under the Influence of Geophysical, Cosmic, and Human Impacts")

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