The ionosphere total electron content (TEC) has always been one of the important error sources in satellite-based navigation and positioning applications. Besides TEC, the rate of TEC index (ROTI) which is derived from TEC, is also served as a significant parameter in monitoring the status of the ionosphere. Based on more than 2,800 GNSS stations in China, as part of the Beidou Satellite Ground Augmentation System (BDSGAS), the ROTI maps were constructed from 2019 to 2022, with the temporal resolution of 300 seconds and the spatial resolution of 0.5°and 0.25° along longitude and latitude, respectively. In order to analyze the seasonal characteristics of ROTI maps during those years, the geomagnetic quiet days in each season are chosen based on hourly geomagnetic Dst index. Among those ROTI maps, the seasonal characteristics are obvious and differ along latitude, in the low latitude the strongest ROTI occurring and related to the scintillations in both spring and autumn, in the middle latitude ROTI active only in summer, and in the high latitude ROTI displaying no activity during each winter.
Part of the book: Ionosphere