17:15 〜 19:15
[PEM12-P14] Morphology of Nighttime MSTIDs Over China
キーワード：MSTID
The morphology of the nighttime MSTIDs are investigated over the entire China sector from January 2014 to August 2017, using data from global navigation satellite systems (GNSS) receivers. Firstly, a comparative case analysis of propagation characteristics reveals the complexity and day-to-day variations of nighttime MSTIDs. The main statistical findings indicate that these periodic disturbances predominantly occur during the summer months, with a higher occurrence rate during solar minimum. In summer, the disturbances occur more frequently in regions with lower latitudes (20-35°N) and tend to exhibit an extended duration. In the meantime, some disturbances are also detected at much lower latitudes (<20°N), with noticeable longitudinal differences. Additionally, there are two peaks in the geographic distribution of disturbances, located in the sector of 90-100°E and 105-125°E at lower latitudes, respectively. The distinct spatiotemporal evolution patterns of the two peak disturbance regions suggest that their formation mechanisms should be different.