Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 126, Issue 6, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JA029037
Keywords
All-sky imager; MSTIDs dissipation; Meridian wind influences on the MSTIDs dissipation; MSTIDs propagation direction change; Zonal wind influences on the MSTIDs propagation
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Funding
- Open Research Project of Large Research Infrastructures of CAS - Study on the interaction between low/mid-latitude atmosphere and ionosphere based on the Chinese Meridian Project
- Chinese Meridian Project
- National Natural Science Foundation of China [41831073, 42004138]
- National Science Foundation
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This study reports a special case of Medium Scale Traveling Ionospheric Disturbances (MSTIDs) over middle-latitude China on August 8, 2016. The MSTIDs were observed by multiple instruments, showing typical characteristics such as wavelength and phase velocity. The study also found that the propagation direction of MSTIDs may be influenced by ionospheric neutral winds.
This study reports a special case of the propagation and morphology of medium scale traveling ionospheric disturbances (MSTIDs) over middle-latitude China on the night of August 8, 2016. The MSTIDs were simultaneously observed by multi-instruments, including the all-sky imager, Swarm satellite, and global positioning system (GPS). The MSTIDs lasted for about 6 h in the field view of airglow imager, showing typical wavelength, phase velocity of 272-296 km and 67-250 m/s, respectively. In addition, the imagers show that the inclination angles of phase fronts for some MSTIDs were decreasing during their propagation, resulting in the propagation direction changed from southwestward to nearly westward. More interestingly, the MSTIDs began to dissipate in the airglow observation when they propagated to lower latitudes (below similar to 40 degrees N) whereas the MSTIDs at higher latitudes were still visible in the later local times. Simulation results from the Thermosphere-Ionosphere-Electrodynamics General Circulation Model are fairly consistent with the Fabry-Perot Interferometer (FPI) wind observations, which provide convincing explanation to show that the variations of ionospheric neutral winds might play important roles in the changes of propagation direction and the dissipation of MSTIDs.
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