Effects of the super-powerful tropospheric western Pacific phenomenon of September–October 2018 on the ionosphere over China: results from oblique sounding
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Published:2023-04-17
Issue:1
Volume:41
Page:173-195
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
Chernogor Leonid F., Garmash Kostiantyn P.ORCID, Guo Qiang, Rozumenko Victor T.ORCID, Zheng YuORCID
Abstract
Abstract. Doppler measurements at oblique propagation paths from
the city of Harbin, the People's Republic of China (PRC), to 10 high-frequency (HF) radio
broadcast stations in the PRC, Japan, Mongolia, and the Republic of Korea
captured the response in the ionosphere to the activity of the super typhoon, Typhoon Kong-rey,
from 30 September to 6 October 2018. The Harbin Engineering University
coherent software-defined radio system generates the database containing
the complex amplitudes of the radio signals that have been acquired along 14 propagation
paths since 2018. The complex amplitudes are used for calculating the
temporal dependences of the Doppler spectra and signal amplitudes, and the
Doppler spectra are used to plot the Doppler shift as a function of time,
fD(t), for all rays. The scientific objectives of this study are to
reveal the possible perturbations caused by the activity of Typhoon Kong-rey
and to estimate the magnitudes of wave parameters of the ionospheric plasma
and radio signals. The amplitudes, fDa, of the Doppler shift variations
were observed to noticeably increase (factor of ∼2–3) on 1–2 and 5–6 October 2018, while the 20–120 min periods, T, of the Doppler
shift variations suggest that the wavelike disturbances in the ionosphere
are caused by atmospheric gravity waves. The periods and amplitudes of
quasi-sinusoidal variations in the Doppler shift, which have been determined
for all propagation paths, may be used to estimate the amplitudes, δNa, of quasi-sinusoidal variations in the electron density. Thus,
T≈20 min and fDa≈0.1 Hz yield δNa≈0.4 %, whereas T≈30 min and
fDa≈0.2 Hz give δNa≈1.2 %. If
T≈60 min and fDa≈0.5 Hz, then δNa≈6 %. The periods T are found to change within the
15–120 min limits, and the Doppler shift amplitudes, fDa, show
variability within the 0.05–0.4 Hz limits.
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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