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Daytime Periodic Wave‐like Structures in the Ionosphere Observed at Low Latitudes over the Asian‐Australian Sector Using Total Electron Content from Beidou Geostationary Satellites
Author(s) -
Huang Fuqing,
Otsuka Yuichi,
Lei Jiuhou,
Luan Xiaoli,
Dou Xiankang,
Li Guozhu
Publication year - 2019
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2018ja026443
Subject(s) - daytime , ionosphere , total electron content , atmospheric sciences , latitude , geostationary orbit , low latitude , middle latitudes , northern hemisphere , local time , atmosphere (unit) , southern hemisphere , gravity wave , climatology , environmental science , tec , geology , meteorology , physics , geophysics , geodesy , gravitational wave , satellite , astrophysics , astronomy , mathematics , statistics
Daytime periodic wave‐like structures are statistically analyzed for the first time in the low‐latitude ionosphere over the Asian‐Australian sector using total electron content from Beidou geostationary satellites during 2016–2017. These structures have periods of about 18–28 min, which frequently occur during 11:00–17:00 local time in the winter at latitudes ranging between 17 and 25°N (10–18°N magnetic latitude [MLAT]) in the Northern Hemisphere, where they have a maximum occurrence rate of 80% at ~21°N (14°N MLAT). In the Southern Hemisphere, daytime periodic wave‐like structures are also observed during 11:00–15:00 local time in the winter within latitudes ranging between 6.0 and 11.1°S (15.4–21.6°S MLAT), although the peak occurrence rate is only approximately 40%. Compared with stratospheric gravity waves (GWs), the seasonal and latitudinal variations of daytime periodic wave‐like structures are generally consistent with those of stratospheric GWs. This gives a possible argument that daytime periodic wave‐like structures in the low‐latitude ionosphere could be generated in the low‐latitude ionosphere and triggered by GWs from the lower atmosphere.