Regional characteristics analysis in China based on the 13th International Geomagnetic Reference Model

Based on the latest 13th International Geomagnetic Reference （IGRF13） Model, the long-term change rates of the seven elements of the regional geomagnetic model in China from 2015 to 2020 were calculated to analyze the long-term change characteristics of the geomagnetic field in China. By analyzing and calculating the long change rate, difference and mean square error between IGRF13 model values and the actual geomagnetic field of 28 geomagnetic stations in China, the results show that: The long-term variation of geomagnetic field shown by IGRF13 model is basically consistent with the actual observed variation of geomagnetic field in China, but there are also obvious differences. IGRF13 model can reflect the characteristics of geomagnetic field in China. When applying IGRF13 model data, the error between local area and actual observation data of the station should also be considered.