Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 36818 10.12737/stp-61202007 Results of current research Results of current research Results of current research Ionospheric disturbances over Eastern Siberia during April 12–15, 2016 geomagnetic storms Ionospheric disturbances over Eastern Siberia during April 12–15, 2016 geomagnetic storms https://orcid.org/0000-0001-5358-2153 Рубцов Александр Валерьевич Rubtsov Aleksandr Valer'evich avrubcov@mail.ru Малецкий Борис Маркович Maletckii Boris Markovich maletskiy@iszf.irk.ru Данильчук Екатерина Игоревна Danilchuk Ekaterina Igorevna danilchuk.k@mail.ru Смотрова Екатерина Евгеньевна Smotrova Ekaterina Evgen'evna katerina.smotrova@mail.ru https://orcid.org/0009-0008-9992-1032 Шелков Алексей Дмитриевич Shelkov Aleksei Dmitrievich ekzereal@gmail.com Ясюкевич Анна Сергеевна Yasyukevich Anna Sergeevna annpol@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН RU Institute of Solar-Terrestrial Physics SB RAS RU Иркутский государственный университет Irkutsk State University 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 6 1 60 68 https://zh-szf.ru/en/nauka/article/36818/view

We present the results of the complex study of ionospheric parameter variations during two geomagnetic storms, which occurred on April 12–15, 2016. The study is based on data from a set of radiophysical and optical instruments. Both the storms with no sudden commencement were generated by high-speed streams from a coronal hole. Despite the minor intensity of the storms (Dst ≥ –55 and –59 nT), we have revealed a distinct ionospheric response to these disturbances. A negative response of electron density and F2-layer critical frequency was observed during the main phase of both the storms. The amplitude of the negative response was higher for the second storm. The period of negative electron density deviations was accompanied by an increase in the peak height, as well as by the downward plasma drift in the evening and night hours, which is not typical of quiet conditions. We have also recorded sharp peaks in the AATR (Along Arc TEC Rate) index and in total electron content noise spikes on average 2–2.5 times. This indicates an intensification of small-scale ionospheric disturbances caused by disturbed geomagnetic conditions and high substorm activity.

We present the results of the complex study of ionospheric parameter variations during two geomagnetic storms, which occurred on April 12–15, 2016. The study is based on data from a set of radiophysical and optical instruments. Both the storms with no sudden commencement were generated by high-speed streams from a coronal hole. Despite the minor intensity of the storms (Dst ≥ –55 and –59 nT), we have revealed a distinct ionospheric response to these disturbances. A negative response of electron density and F2-layer critical frequency was observed during the main phase of both the storms. The amplitude of the negative response was higher for the second storm. The period of negative electron density deviations was accompanied by an increase in the peak height, as well as by the downward plasma drift in the evening and night hours, which is not typical of quiet conditions. We have also recorded sharp peaks in the AATR (Along Arc TEC Rate) index and in total electron content noise spikes on average 2–2.5 times. This indicates an intensification of small-scale ionospheric disturbances caused by disturbed geomagnetic conditions and high substorm activity.

 ionosphere GNSS incoherent scatter radar geomagnetic storms ionospheric disturbances ionosphere GNSS incoherent scatter radar geomagnetic storms ionospheric disturbances

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