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根据2001～2007年期间在菲律宾境内测量的74个点的地磁场数据,利用球冠谐和、泰勒多项式两种方法建立了2005.0菲律宾及周边地区地磁基本场模型,得到了菲律宾地区X、Y、Z、D、I、H、F七个分量的分布.两种模型反映的同一地区的地磁场分布形态基本类似,只在拐点的舒缓度、等值线平滑度等方面存在区别.在8°N左右,X、H、F出现系统的拐点,同纬度的X、H、F东低西高.D、y零线分布于8°N左右呈东西展布,北侧为负,南侧为正,等值线沿经度分布的同时,在纬度上有不同程度的小起伏.Z、I空间分布呈现更加规则均匀的东西向分布特征.零线分布在7.5°N左右,零线北部是正值区域,南部是负值区域.两种模型与IGRF的差值的分布形态有很大的不同,球冠谐模型与IGRF模型差值的正负异常区域呈现正负异常相间的分布特征,且各分量的正负异常最大值分布在低纬度地区.而泰勒多项式与IGRF差值的正负异常分布却相对完整.
Based on the geomagnetic data of 74 points measured in the Philippines from 2001 to 2007, the basic geomagnetic field model in the Philippines and surrounding area of 2005.0 was established by using the spherical-crown harmonic and Taylor polynomial method. The results of X, Y, Z, D, I, H and F. The distribution of geomagnetic field in the same area reflected by the two models is basically similar, but there is difference only in the slippage of inflexion point, contour smoothness, etc. At 8 ° N, X, H, F appear system inflection point, the same latitude X, H, F east low west. D, y zero line distribution around 8 ° N was east-west distribution, north is negative, south is positive , While the contour line distributes along the longitude and latitude with varying degrees of undulation. The spatial distribution of Z and I exhibits a more even distribution of east-west distribution. The distribution of zero line is about 7.5 ° N and the north of the zero line is positive Region and the south are negative regions.The distribution patterns of the difference between the two models and IGRF are very different, the positive and negative anomaly regions of the difference between the spherical-crown harmonic model and the IGRF model exhibit positive and negative anomalies, and each The positive and negative components of the maximum distribution in the low latitudes. And Taylor many Abnormal distribution of positive and negative IGRF difference is relatively complete.