Abstract:Using the regional ionospheric grid data and spectral analysis method, we study the ionospheric period difference and extreme value difference in different regions of China. Moreover, using the ionospheric gradient calculation method, we analyze the small-scale spatiotemporal variation characteristics of ionosphere in different regions. The results show that compared with the northern region, the ionospheric periodicity is more obvious in the southern region. When the longitude changes by 5°, most of the TEC changes are between -10 and 10 TECu. When latitude changes by 2.5°, the TEC varies from -20 to 20 TECu, and there is a great difference between the north and south region, but little difference between the east and west. When the time interval is 1 hour, most ionospheric TEC changes in China are between 5 and 25 TECu, and there is a great difference in the time variation characteristics between the north and south region, but little difference between the east and west. However, with the increase of the time interval, the difference in the time variation characteristics between the east and west is gradually more obvious. The conclusions can provide theoretical reference for real-time ionospheric modeling in China and have certain referential significance for ionospheric spatiotemporal changes and ionospheric magnetic storm monitoring in China.
LI Runchuan,ZHANG Zhetao,WEN Yuanlan et al. Analysis of Ionospheric Characteristics of Time-Space-Frequency Domains in Different Regions of China[J]. jgg, 2022, 42(9): 944-950.