Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data

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Title:	Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data
Authors:	劉正彥;Chum, Jaroslav;Liu, Jann-yenq;Chen, Shih-ping;Cabrera, Miguel Angel;Lastovicka, Jan;Base, Jirí;Buresová, Dalia;Fiser, Jirí;Hruska, Frantisek;Ezquer, Rodolfo
Contributors:	地球科學學院太空科學與工程學系
Keywords:	3. Space science;Earth and Environmental Science;Earth Sciences;Geology;Geophysics/Geodesy;Global positioning systems;GPS;Ionization;Wind speed
Date:	2016-12-01
Issue Date:	2026-04-23 11:06:08 (UTC+8)
Publisher:	Springer International Publishing AG;Berlin/Heidelberg: Springer Science and Business Media LLC
Abstract:	摘要： A relatively new method based on measurements by multipoint continuous Doppler sounding is applied to study the occurrence rate, propagation velocities, and directions of spread F structures over Tucumán, Northern Argentina, and Taiwan, both of which were under the crest of the equatorial ionization anomaly in 2014. In addition, spread F is studied globally over the same time period from the S4 scintillation index measured onboard FORMOSAT-3/COSMIC (F3/C) satellite. It is shown that the continuous Doppler sounding gives results that are consistent with S4 data and with previous optical, global positioning system (GPS), and satellite measurements. Most of the spread F events were observed from September to March, i.e., during the local summer half of the year in Tucumán, whereas in Taiwan, the highest occurrence rate was observed around equinoxes. The occurrence rate in Tucumán was about four times higher than that in Taiwan. The propagation velocities and directions were estimated from the Doppler shift spectrograms. The spread structures related to spread F propagated roughly eastward at velocities from ~70 to ~200 m s −1 during nighttime hours. The mean observed horizontal velocity was 140 m s −1 over Tucumán and 107 m s −1 over Taiwan. The local times at which the highest velocities were observed roughly correspond to local times with highest values of scintillation index S4, at ~20 to 23 LT. In addition, a comparison of measured drift velocities with neutral wind velocities predicted by models is provided. The observed velocities usually exceeded the horizontal neutral wind velocities predicted by the HWM14 model for the locations and times of observations. 其他題名： Earth Planet Sp 出版者： Berlin/Heidelberg: Springer Science and Business Media LLC 出版日期： 2016-04-08 出處： Earth, Planets and Space, 2016-04, Vol.68 (1), p.56-, Article 56 資源來源： Publicly available content database 版權： Chum et al. 2016 版權： Earth, Planets and Space is a copyright of Springer, 2016. 識別號： ISSN: 1880-5981 識別號： ISSN: 1343-8832 識別號： EISSN: 1880-5981 識別號： DOI: 10.1186/s40623-016-0433-1
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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