Bibliography

Effect of Weak Magnetic Storms on the Propagation of HF Radio Waves

Vertical and oblique sounding data for northeastern Russia have been used to analyze the conditions for the propagation of radio waves during weak geomagnetic storms observed in fall seasons of 2018–2020 at minimal solar activity. Even during weak storms, the maximum observed frequencies have been found to decrease by 25–35\% in daytime and by 40–50\% at night. Variations in the parameters of the distribution of high frequency radio waves during disturbances depend on the spatio-temporal dynamics of large scale structures of the high-latitude ionosphere, which, in turn, depends on the processes of magnetosphere–ionosphere interaction. Here, the depth and duration of the negative disturbance are larger if the geomagnetic storm occurs on a disturbed background.

Kurkin, V.; Polekh, N.; Zolotukhina, N.;

Published by: Geomagnetism and Aeronomy      Published on: feb

YEAR: 2022     DOI: 10.1134/S0016793222020116

The ionosphere response to severe geomagnetic storm in March 2015 on the base of the data from Eurasian high-middle latitudes ionosonde chain

The pattern of ionospheric disturbances caused by complex interplanetary structure on 19--22 December 2015

The pattern of the ionospheric storm that was observed during the severe two-step geomagnetic storm on 19\textendash22 December 2015 in East Asia is investigated. The study is performed using a combination of vertical and oblique-incidence sounding, total electron content, riometer and magnetometer data obtained near 120\textdegree E meridian in 19\textendash66\textdegree N latitude zone. The revealed ionospheric disturbances are compared with the features of ionospheric storm, developed over the same region during the severe one step magnetic storm on 14\textendash16 December 2006. Compared magnetic storms are almost identical in the season and the onset time. They have approximately equal peak intensities (Dst = -155 nT and -162 nT), but differ noticeably in the duration of the main phases (19 h and 2.5 h) and the rate of the ring current field amplification. Through the comparison the ionospheric disturbances which are similar and dissimilar for both storms are revealed. Our study suggests that the main differences between ionospheric storms were observed during the initial and early recovery phases. They could be due to the differences between pre-storm states of the magnetosphere-ionosphere system as well as between interplanetary drivers.

Kurkin, V.I.; Polekh, N.M.; Zolotukhina, N.A.;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 11/2018

YEAR: 2018     DOI: 10.1016/j.jastp.2018.07.003

Dynamics of ionospheric disturbances during the 17\textendash19 March 2015 geomagnetic storm over East Asia

Dynamics of ionospheric disturbances during the 17—19 March 2015 geomagnetic storm over East Asia

Based on vertical sounding data from nine ionosondes located at 19–66N, 100–130E we investigated the latitude-temporal dynamics of ionospheric disturbances during the 17–19

Polekh, N; Zolotukhina, N; , Kurkin; Zherebtsov, G; Shi, J; Wang, G; Wang, Z;

Published by: Advances in Space Research      Published on:

YEAR: 2017     DOI: 10.1016/j.asr.2017.09.030

Studying the ionosphere response to severe geomagnetic storm in March 2015 according to Eurasian ionosonde chain

Shpynev, BG; Zolotukhina, NA; Polekh, NM; Chernigovskaya, MA; Ratovsky, KG; Belinskaya, Yu; Stepanov, AE; Bychkov, VV; Grigorieva, SA; Panchenko, VA; , others;

Published by: Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa      Published on:

YEAR: 2017     DOI:

Ionospheric effects of magnetospheric and thermospheric disturbances on March 17--19, 2015

Using vertical and oblique radio-sounding data, we analyze the ionospheric and thermospheric disturbances during the magnetic storm that occurred in northeastern Russia on March 17\textendash19, 2015. We consider the heliospheric sources that induced the magnetic storm. During the main and early recovery phases, the midlatitude stations are characterized by extremely low values of electron density at the F2 layer maximum. Using oblique sounding data, we recorded signals that propagated outside the great circle arc. In evening and night hours, no radio signals were found to pass along the Norilsk\textendashIrkutsk and Magadan\textendashIrkutsk paths. The observed ionospheric effects are shown to be caused by a sharp shift of the boundaries of the main ionospheric trough to the invariant latitude 46\textdegree N during the main phase of the magnetic storm. The negative ionospheric disturbance during the recovery phase of the storm, which was associated with significant variations in the composition of the neutral atmosphere, led to a change in the mode composition of received radio signals and a decline in observed maximal frequencies in daytime hours of March 18, 2015 by more than 2 times.

Polekh, N.; Zolotukhina, N.; Romanova, E.; Ponomarchuk, S.; Kurkin, V.; Podlesnyi, A.;

Published by: Geomagnetism and Aeronomy      Published on: 09/2016

YEAR: 2016     DOI: 10.1134/S0016793216040174

Studying Peculiarities of Ionospheric Response to the 2015 March 17-19 Geomagnetic Storm in East Asia: Observations and Simulation

Romanova, Elena; Zherebtsov, Gelii; Polekh, Nelya; Wang, Xiao; Wang, Guojun; Zolotukhina, Nina; Shi, Jiankui;

Published by: 41st COSPAR Scientific Assembly      Published on:

YEAR: 2016     DOI:

Ionospheric effects of magnetospheric and thermospheric disturbances on March 17—19, 2015

Using vertical and oblique radio-sounding data, we analyze the ionospheric and thermospheric disturbances during the magnetic storm that occurred in northeastern Russia on March

Polekh, NM; Zolotukhina, NA; Romanova, EB; Ponomarchuk, SN; Kurkin, VI; Podlesnyi, AV;

Published by: Geomagnetism and Aeronomy      Published on:

YEAR: 2016     DOI:

Backscattering dynamics during intense geomagnetic storm as deduced from Yekaterinburg radar data: March 17-22, 2015

This paper examines the spatio-temporal dynamics of backscattering signals during St. Patrick’s Day two-step intense geomagnetic storm from the Yekaterinburg Coherent Radar (

Zolotukhina, NA; Kurkin, VI; Polekh, NM; Romanova, EB;

Published by: Solar-Terrestrial Physics      Published on:

YEAR: 2016     DOI:

Ionospheric effects of solar flares and their associated particle ejections in March 2012

Flares of March 4\textendash9, 2012 were accompanied by an intensification of solar electromagnetic and corpuscular radiations and five coronal mass ejections. Bursts of X-rays and increased solar cosmic ray fluxes caused an increase in ionospheric absorption manifesting itself in data from vertical sounding stations as enhancements of the lowest frequency of reflections up to 4\textendash6\ MHz at the daytime and as the disappearance of reflections in the ionograms of high latitude stations. Interplanetary coronal mass ejections (ICME) generated March 7\textendash8 moderate and March 8\textendash11 intense magnetic storms accompanied by ionospheric disturbances. At the peaks of both magnetic storms there were abrupt afternoon\textendashevening decreases in the ionospheric F2-layer critical frequency (foF2). During the March 7\textendash8 storm, the foF2 decrease concurred with the reversal of the interplanetary magnetic field azimuthal component (IMF By) which initiated restructuring of magnetospheric convection; during the March 8\textendash11 storm, with the abrupt weakening of the interplanetary magnetic field southward component (IMF Bz) which triggered a substorm.

Zolotukhina, N.; Polekh, N.; Kurkin, V.; Romanova, E.;

Published by: Advances in Space Research      Published on: 06/2015

YEAR: 2015     DOI: 10.1016/j.asr.2015.03.004

Ionospheric disturbance; Magnetic storm; X-ray flare; Solar cosmic rays; Coronal mass ejection

Ionospheric response to geomagnetic storm on July 14-17, 2012 in East Asia

Romanova, Elena; Zherebtsov, Gelii; Wang, Guojun; Zolotukhina, Nina; Polekh, Nelya; Wang, Xiao; Shi, Jiankui;

Published by: 40th COSPAR Scientific Assembly      Published on:

YEAR: 2014     DOI: