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• W4281725960 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> This paper deals with the variations in the Doppler spectra and in the relative amplitudes of the signals observed at oblique incidence over the People's Republic of China (PRC) during the partial solar eclipse of 5–6 January 2019 and on reference days. The observations were made using the multifrequency multipath radio system for sounding the ionosphere at oblique incidence. The receiver system is located at the Harbin Engineering University, PRC, and 14 HF broadcasting station transmitters are used for taking measurements along the following radio-wave propagation paths: Lintong/Pucheng to Harbin, Hwaseong to Harbin, Chiba/Nagara to Harbin, Hailar/Nanmen to Harbin, Beijing to Harbin (three paths), Goyang to Harbin, Ulaanbaatar/Khonkhor to Harbin, Yakutsk to Harbin (two paths), Shijiazhuang to Harbin, Hohhot to Harbin, and Yamata to Harbin. The specific feature of this partial solar eclipse was that it occurred during the local morning with a geomagnetic disturbance (Kp <span class=inline-formula>≈</span> 3<span class=inline-formula>−</span>) in the background. The response of the ionosphere to the solar eclipse has been inferred from temporal variations in the Doppler spectra, the Doppler shift, and the signal relative amplitude. The partial solar eclipse was found to be associated with broadening of the Doppler spectrum, up to <span class=inline-formula>±</span> 1.5 Hz, alternating sign Doppler-shift variations, up to <span class=inline-formula>±</span> 0.5 Hz, in the main ray, and quasi-periodic Doppler-shift changes. The relative amplitude of electron density disturbances in the 15 min period of atmospheric gravity wave field and in the 4–5 min period of infrasound wave field is estimated to be 1.6 %–2.4 % and 0.2 %–0.3 %, respectively. The estimates of a maximum decrease in the electron density are in agreement with the observations." @default.
• W4281725960 created "2022-06-13" @default.
• W4281725960 date "2022-06-10" @default.
• W4281725960 modified "2023-10-01" @default.
• W4281725960 title "Comment on angeo-2022-15" @default.
• W4281725960 doi "https://doi.org/10.5194/angeo-2022-15-rc1" @default.
• W4281725960 hasPublicationYear "2022" @default.
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