2003•Chinese Journal of GeophysicsRequires access

Spherical Cap Harmonic Analysis of the Chinese Geomagnetic Reference Field in 1936

Zhenchang An

Abstract

Abstract Based on the geomagnetic survey data in the eastern and central regions of China for 1936, and the international geomagnetic reference fields DGRF1935 and DGRF1940, using the method of the spherical cap harmonic analysis, the spherical cap harmonic (SCH) model of the Chinese geomagnetic reference field for 1936 (CGRF1936) is calculated. The truncation order of the SCH model is 8, the pole of the spherical cap is at 36°N and 104°E, and its half‐angle is 30°. The CGRF1936 can express the distribution of the geomagnetic field in China better than the corresponding DGRF. The root mean square (RMS) deviations of SCH model are 104.9nT for X, 84.8nT for Y and 121.1nT for Z, respectively. Based on the SCH model of the geomagnetic field, the geomagnetic charts (X, Y, Z, F) and the anomaly charts (ΔX,ΔY,ΔZ,ΔF) in China for 1936 are drawn.

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Key concepts: Earth's magnetic field, Spherical cap, Spherical harmonics, Geodesy, Geophysics, Physics, Geomagnetic secular variation, Truncation (statistics)