Articles | Volume 40, issue 5
https://doi.org/10.5194/angeo-40-585-2022
© Author(s) 2022. 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-40-585-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Ionospheric effects of the 5–6 January 2019 eclipse over the People's Republic of China: results from oblique sounding
Leonid F. Chernogor
Department of Space Radio Physics, V. N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv, 61022, Ukraine
College of Information and Communication Engineering, Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin, 150001, China
College of Electronic Information, Qingdao University, 308 Ningxia Road, Qingdao, 266071, China
Kostyantyn P. Garmash
Department of Space Radio Physics, V. N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv, 61022, Ukraine
Qiang Guo
College of Information and Communication Engineering, Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin, 150001, China
Victor T. Rozumenko
Department of Space Radio Physics, V. N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv, 61022, Ukraine
College of Electronic Information, Qingdao University, 308 Ningxia Road, Qingdao, 266071, China
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Short summary
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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.
Leonid Chernogor
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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, Kostiantyn P. Garmash, Qiang Guo, Victor T. Rozumenko, and Yu Zheng
Ann. Geophys., 41, 173–195, https://doi.org/10.5194/angeo-41-173-2023, https://doi.org/10.5194/angeo-41-173-2023, 2023
Short summary
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.
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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 %).
The solar eclipse of 5–6 January 2019 perturbed the ionospheric electron density, N, observed...