supported by the National Natural Science Foundation of China(Grant Nos.41404053 and 41174165);Special Project for Meteo-Scientific Research in the Public Interest(Grant No.GYHY201306073);Natural Science Foundation of Higher Education Institutions of Jiangsu Province,China(Grant No.14KJB170012)
The selection of the truncation level (TL) and the control of boundary effect (BE) are critical in regional geomagnetic field models that are based on data fitting. We combine Taylor and Legendre polynomials to mo...