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《Chinese Journal of Geophysics》 2010-12
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Calculation and analysis of geomagnetic field horizontal gradients in China

FENG Yan~1 , PAN Jian-Jun~(1*) , AN Zhen-Chang~2, SUN Han~3, MAO Fei~4 1 The College of Resources and Environmental Sciences , Nanjing Agricultural University,Nanjing 210000, China 2 Institute of Geology and Geophysics , Chinese Academy of Sciences , Beijing 100029, China 3 Remote Sensing Application and Experiment Station of National Satellite Meteorological Center /GuangxiMeteorological Disaster Mitigation Institute, Nanning 530022, China 4 Chinese Academy of Meteorological Sciences, Beijing 100081, China  
Based on survey data of 156 observatories and repeat stations of China,6 observatories and 36 IGRF points outside the China in 2000,the geomagnetic field models of total intensity(F) , declination(D) and inclination(I) are established by Taylor polynomial model and Surface Spline model, meanwhile, the differential for φ (latitude) and A (longitude) of models is carried out to calculate the geomagnetic horizontal gradients, respectively. Then the gradients distribution charts of corresponding components in south-north and east-west direction are drawn, from which a comparison between horizontal gradient charts and IGRFIO for 2000 is made, consistency and difference among these three kinds of horizontal gradient are implemented, too. Finally, the spacial distribution of horizontal gradient is analyzed numerically. Results showed that horizontal gradients of F and I varied mainly with latitude, which of F ranged from 7. 0 nT/min to 6. 0 nT/min while latitude increased, and got the biggest values in the central region (25°~35°N,90o~120 E) of China,I's gradients varied range from 2'/min to 1'/min while latitude increased, D's gradients varied with both latitude and longitude, which ranged from 0. 4 /min to -0. 3 /min in north-south direction while longitude increased and -0. 1 /min to -0. 4 /min in east-west direction while latitude increased respectively.
【Fund】: 国家高技术研究发展计划课题研究专项(2007AA12Z328)资助
【CateGory Index】: P318
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