Articles | Volume 41, issue 1
https://doi.org/10.5194/angeo-41-173-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-41-173-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Effects of the super-powerful tropospheric western Pacific phenomenon of September–October 2018 on the ionosphere over China: results from oblique sounding
Leonid F. Chernogor
Department of Space Radio Physics, V. N. Karazin Kharkiv National University, Kharkiv, 61022, Ukraine
College of Information and Communication Engineering, Harbin Engineering University, Harbin, 150001, China
College of Electronic Information, Qingdao University, Qingdao, 266071, China
Kostiantyn P. Garmash
Department of Space Radio Physics, V. N. Karazin Kharkiv National University, Kharkiv, 61022, Ukraine
Qiang Guo
College of Information and Communication Engineering, Harbin Engineering University, Harbin, 150001, China
Victor T. Rozumenko
Department of Space Radio Physics, V. N. Karazin Kharkiv National University, Kharkiv, 61022, Ukraine
College of Electronic Information, Qingdao University, Qingdao, 266071, China
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This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
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A unique multi-step storm of March 21–26, 2024, was studied in detail. Assessments of the energetics of geospace, magnetospheric and magnetic storms were carried out. The strongest storm of March 24–25, 2024, was compared to the storms of April 23–24, 2023, May 10–11, 2024, and to the Carrington event. Differences in magnetic disturbances in the eastern and western hemispheres have been found.
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From May 10 to 12, 2024, a strong geomagnetic storm impacted Earth’s magnetic field and ionosphere over China. Using ground-based and satellite data, this study identified 2.5 days of magnetic disturbances and sharp electron density reductions alongside an uplift of the main ionospheric layer. Negative storm effects from electric fields, plasma motion, and composition changes inform space weather forecasting and system protection.
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This study, for the first time, convincingly attests to the two-step geospace storm being the best possible solar–terrestrial event of opportunity for realizing a technique for estimating the interplanetary magnetic field (IMF) Bz component threshold for the formation of the substorm current wedge. The data from INTERMAGNET magnetometer network on the two-step geospace 23–24 April 2023 storm yield the IMF Bz threshold for the formation of the substorm current wedge of –(22–30) nT.
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Revised manuscript not accepted
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The Tonga volcano explosion launched a rich assortment of disturbances in the solid Earth, ocean, entire atmosphere, and the ionosphere and magnetosphere. Statistical and spectral analysis of the measurements made at 19 INTERMAGNET recording stations closest to the volcano shows that the quasi-periodic disturbances were transported by fast and slow magnetohydrodynamic waves, blast wave, atmospheric gravity wave, and Lamb wave; the parameters of geomagnetic bay disturbances have also estimated.
Leonid F. Chernogor, Kostyantyn P. Garmash, Qiang Guo, Victor T. Rozumenko, and Yu Zheng
Ann. Geophys., 40, 585–603, https://doi.org/10.5194/angeo-40-585-2022, https://doi.org/10.5194/angeo-40-585-2022, 2022
Short summary
Short summary
The solar eclipse of 5–6 January 2019 perturbed the ionospheric electron density, N, observed with the receiver at the Harbin Engineering University and 14 HF broadcasting stations ~1 000 km around. It was accompanied by ±1.5 Hz Doppler-spectrum broadening, ±0.5 Hz Doppler shift, fD, variations, 15 min period variations in fD caused by 1.6–2.4 % perturbations in N, and period changes of 4–5 min in fD caused by 0.2–0.3 % disturbances in N. The decrease in N attained ~15 % (vs. modeled 16 %).
Yiyang Luo, Leonid Chernogor, Kostiantyn Garmash, Qiang Guo, Victor Rozumenko, and Yu Zheng
Ann. Geophys., 39, 657–685, https://doi.org/10.5194/angeo-39-657-2021, https://doi.org/10.5194/angeo-39-657-2021, 2021
Short summary
Short summary
The 30 August–2 September 2019 geospace storm and its influence on the characteristics of high frequency radio waves over the People's Republic of China have been analyzed. The geospace storm was weak, the magnetic storm was moderate, and the ionospheric storm was moderate to strongly negative, which manifested itself by the reduction in the ionospheric F-region electron density. Appreciable disturbances were also observed to occur in the ionospheric E-region and possibly in the Es layer.
Leonid F. Chernogor
EGUsphere, https://doi.org/10.5194/egusphere-2025-4375, https://doi.org/10.5194/egusphere-2025-4375, 2025
This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
Short summary
Short summary
A unique multi-step storm of March 21–26, 2024, was studied in detail. Assessments of the energetics of geospace, magnetospheric and magnetic storms were carried out. The strongest storm of March 24–25, 2024, was compared to the storms of April 23–24, 2023, May 10–11, 2024, and to the Carrington event. Differences in magnetic disturbances in the eastern and western hemispheres have been found.
Tao Xu, Yaya Liu, Leonid Chernogor, Zhejun Jin, Mykyta Shevelev, Yevhen Zhdanko, and Yu Zheng
EGUsphere, https://doi.org/10.5194/egusphere-2025-3661, https://doi.org/10.5194/egusphere-2025-3661, 2025
This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
Short summary
Short summary
From May 10 to 12, 2024, a strong geomagnetic storm impacted Earth’s magnetic field and ionosphere over China. Using ground-based and satellite data, this study identified 2.5 days of magnetic disturbances and sharp electron density reductions alongside an uplift of the main ionospheric layer. Negative storm effects from electric fields, plasma motion, and composition changes inform space weather forecasting and system protection.
Leonid F. Chernogor
Ann. Geophys., 43, 15–35, https://doi.org/10.5194/angeo-43-15-2025, https://doi.org/10.5194/angeo-43-15-2025, 2025
Short summary
Short summary
This study, for the first time, convincingly attests to the two-step geospace storm being the best possible solar–terrestrial event of opportunity for realizing a technique for estimating the interplanetary magnetic field (IMF) Bz component threshold for the formation of the substorm current wedge. The data from INTERMAGNET magnetometer network on the two-step geospace 23–24 April 2023 storm yield the IMF Bz threshold for the formation of the substorm current wedge of –(22–30) nT.
Leonid Chernogor
Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2023-27, https://doi.org/10.5194/angeo-2023-27, 2023
Revised manuscript not accepted
Short summary
Short summary
The Tonga volcano explosion launched a rich assortment of disturbances in the solid Earth, ocean, entire atmosphere, and the ionosphere and magnetosphere. Statistical and spectral analysis of the measurements made at 19 INTERMAGNET recording stations closest to the volcano shows that the quasi-periodic disturbances were transported by fast and slow magnetohydrodynamic waves, blast wave, atmospheric gravity wave, and Lamb wave; the parameters of geomagnetic bay disturbances have also estimated.
Leonid F. Chernogor, Kostyantyn P. Garmash, Qiang Guo, Victor T. Rozumenko, and Yu Zheng
Ann. Geophys., 40, 585–603, https://doi.org/10.5194/angeo-40-585-2022, https://doi.org/10.5194/angeo-40-585-2022, 2022
Short summary
Short summary
The solar eclipse of 5–6 January 2019 perturbed the ionospheric electron density, N, observed with the receiver at the Harbin Engineering University and 14 HF broadcasting stations ~1 000 km around. It was accompanied by ±1.5 Hz Doppler-spectrum broadening, ±0.5 Hz Doppler shift, fD, variations, 15 min period variations in fD caused by 1.6–2.4 % perturbations in N, and period changes of 4–5 min in fD caused by 0.2–0.3 % disturbances in N. The decrease in N attained ~15 % (vs. modeled 16 %).
Yiyang Luo, Leonid Chernogor, Kostiantyn Garmash, Qiang Guo, Victor Rozumenko, and Yu Zheng
Ann. Geophys., 39, 657–685, https://doi.org/10.5194/angeo-39-657-2021, https://doi.org/10.5194/angeo-39-657-2021, 2021
Short summary
Short summary
The 30 August–2 September 2019 geospace storm and its influence on the characteristics of high frequency radio waves over the People's Republic of China have been analyzed. The geospace storm was weak, the magnetic storm was moderate, and the ionospheric storm was moderate to strongly negative, which manifested itself by the reduction in the ionospheric F-region electron density. Appreciable disturbances were also observed to occur in the ionospheric E-region and possibly in the Es layer.
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Short summary
The receiver at the Harbin Engineering University and eight surrounding HF broadcast stations ~1000 km observed the response in the ionospheric electron density to the activity of Typhoon Kong-rey (30 September–6 October 2018). On 1–2 and 5–6 October 2018, the 20 min to 60 min period quasi-sinusoidal variations in the electron density with an amplitude of 0.4 % to 6 % resulted in 0.1 Hz to 0.5 Hz amplitude Doppler shift variations, a factor of 2–3 increase as compared to a quiet time reference.
The receiver at the Harbin Engineering University and eight surrounding HF broadcast stations...