Geomagnetic survey and geomagnetic model research in China

	Geomagnetic survey and geomagnetic model research in China
	Gu, ZW ; Zhan, ZJ ; Gao, JT ; Han, W ; An, ZC ; Yao, TQ ; Chen, B
刊名	EARTH PLANETS AND SPACE
	2006
卷号	58 期号:6 页码:741-750
关键词	geomagnetic survey geomagnetic model Taylor polynomial model spherical cap harmonic model China
ISSN号	1343-8832
文献子类	Article
英文摘要	The geomagnetic survey at 135 stations in China were carried out in 2003. These stations are with better environmental condition and small magnetic field gradient (<5 nT/m). In the field survey, the geomagnetic declination D, the inclination I and the total intensity F were measured. Ashtech ProMark2 differential GPS (Global Positioning System) was used in measuring the azimuth, the longitude, the latitude and the elevation at these stations. The accuracy of the azimuth is 0.1'. The geomagnetic survey data were reduced using the data at geomagnetic observatories in China. The mean standard deviations of the geomagnetic reduced values are: <1.5 nT for F, <0.5' for D and I. Using the geomagnetic data which include the data at 135 stations and 35 observatories in China, and the data at 38 IGRF (International Geomagnetic Reference Field) calculation points in China's adjacent regions, the Taylor polynomial model and the spherical cap harmonic model were calculated for the geomagnetic field in China. The truncation order of the Taylor polynomial model is 5, and its original point is at 36.0 degrees N and 104.5 degrees E. Based on the geomagnetic anomalous values and using the method of spherical cap harmonic (SCH) analysis, the SCH model of the geomagnetic anomalous field was derived. In the SCH model, the pole of the spherical cap is at 36.0 degrees N and 104.5 degrees E, and the half-angle is 30 degrees, the truncation order K = 8 is determined according to the mean square deviation between the model calculation value and the observation value, the AIC (Akaike Information Criterion) and the distribution of geomagnetic field.
WOS关键词	REFERENCE FIELD
WOS研究方向	Geology
语种	英语
出版者	TERRA SCIENTIFIC PUBL CO
WOS记录号	WOS:000238352600009
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66670]
专题	中国科学院地质与地球物理研究所
通讯作者	Gu, ZW
作者单位	1.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Gu, ZW,Zhan, ZJ,Gao, JT,et al. Geomagnetic survey and geomagnetic model research in China[J]. EARTH PLANETS AND SPACE,2006,58(6):741-750.
APA	Gu, ZW.,Zhan, ZJ.,Gao, JT.,Han, W.,An, ZC.,...&Chen, B.(2006).Geomagnetic survey and geomagnetic model research in China.EARTH PLANETS AND SPACE,58(6),741-750.
MLA	Gu, ZW,et al."Geomagnetic survey and geomagnetic model research in China".EARTH PLANETS AND SPACE 58.6(2006):741-750.