Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 5, pp. 357-376
Ionospheric and thermospheric effects over Eurasia at high and middle latitudes during the magnetic storm in October 2016
M.A. Chernigovskaya
1 , K.G. Ratovsky
1 , A.G. Setov
1 , D.S. Khabituev
1 , A.S. Yasyukevich
1 , A.S. Kalishin
2 , A.E. Stepanov
3 , A.Yu. Belinskaya
4 , V.V. Bychkov
5 , S.A. Grigorieva
6 , V.A. Panchenko
7 1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
2 Arctic and Antarctic Research Institute, Saint Petersburg, Russia
3 Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS, Yakutsk, Russia
4 Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia
5 Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, Paratunka, Kamchatka Krai, Russia
6 Institute of Geophysics UB RAS, Ekaterinburg, Russia
7 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Troitsk, Moscow, Russia
Accepted: 18.09.2024
DOI: 10.21046/2070-7401-2024-21-5-357-376
Variations in ionospheric and thermospheric parameters over the Eurasian region were studied based on the analysis of data from high- and mid-latitude chains of ionosondes and GPS/GLONASS (GPS — Global Positioning System/GLONASS GLONASS — rus. GLObalnaya NAvigatsionnaya Sputnikovaya Sistema) receivers during the period of a strong magnetic storm in October 2016. Significant latitude and longitude differences were noted in the features of temporal variations in the electron concentration of the ionosphere both in quiet conditions before the onset of a magnetic storm and during its development. According to measurements from high-latitude ionosondes in Zhigansk, Amderma, Lovozero, Sodankylä and mid-latitude ionosondes in Paratunka, Yakutsk, and Irkutsk, a manifestation of the pre-storm effect was recorded as an increase in the maximum daily critical frequency foF2 on October 12, 2016, half a day before the sudden storm commencement. During the main phase of the magnetic storm, a changeover from the positive to the negative effect of the ionospheric storm was observed in both high and middle latitudes over Eurasia. During and after the recovery phase of the magnetic storm, the effect of a negative ionospheric storm was observed until the ionosphere was restored to the level of quiet days by October 20–21, 2016. The changeover from an increase in electron concentration to a sharp decline was especially pronounced in the ionosphere of the middle latitudes of Eurasia. The negative ionospheric storm effect during the recovery phase of the magnetic storm was caused by the formation of vast areas of atmospheric gas with a reduced [O]/[N2] concentration ratio over the high- and mid-latitude region of Eurasia.
Keywords: high-latitude ionosphere, mid-latitude ionosphere, ionosonde chain, geomagnetic storm, variations in ionosphere ionization, variations in thermosphere composition
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