FENG Yan,
JIANG Yong,
SUN Han et al
.2018.The three-dimensional surface Spline model of geomagnetic field.Chinese Journal Of Geophysics,61(4): 1352-1365,doi: 10.6038/cjg2018K0217
The three-dimensional surface Spline model of geomagnetic field
FENG Yan1,2, JIANG Yong1, SUN Han3, AN ZhenChang4, HUANG Ya2
1. Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China; 3. Xintianyuan Institute of Disaster Prevention and Reduction, Inner Mongolia, Hohhot 010051, China; 4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract：Based on 149 surface observations and 50 CHAMP measuring data, along with newest 12 Chinese Meridian Project observations, as well as the 50 points of IGRF12 that lie in the level of 180 km, we created the three-dimensional Surface Spline (3D Spline) model of Chinese mainland for the first time. The boundary effect was controlled by 39 complimentary points. All data were removed the different field sources by CM4 model, so the created 3D Spline model expresses the regional main field. We have analyzed and compared the modeling values with that of Surface Spline (2D Spline), Taylor polynomial (2D Taylor), three-dimensional Taylor polynomial (3D Taylor) models and IGRF12. Results show the overall trends of elements X,Y,Z and F among these models are basically consistent, but the isolines of 3D Spline are relatively more tortuous. Moreover, the intensity of Y decreases while altitude increases. Through comparing the modeling values, residuals and Root-Mean-Square-Errors (RMSE) of 6 intentional missing points between 3D Spline, 2D and 3D Taylor models, results imply the former is better than others. RMSEs of Y,Z and F of 3D Spline are over 50% less than that of other models. The modeling precision of 3D Spline model at different altitudes largely depends upon the number and precision of measuring points at adjacent altitudes.
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