基于空间加权法的地磁数据重构精度与Dst指数的关系  

Study on the relationship between the reconstruction accuracy of geomagnetic data based on spatial weighting method and D index

作　　者：顾慧冬 姚休义[2] 李东林 GU Huidong;YAO Xiuyi;LI Donglin(Lijiang Seismic Station,Yunnan Province 674100,China;Yunnan Earthquake Agency,Kunming 650224,China;Yunnan University,Kunming 650224,China)

机构地区：[1]丽江地震台,中国云南674100 [2]云南省地震局,中国昆明650224 [3]云南大学,中国昆明650224

出　　处：《地震地磁观测与研究》2020年第3期91-97,共7页Seismological and Geomagnetic Observation and Research

基　　金：云南省地震局青年地震科学基金(项目编号:2017K12)。

摘　　要：为了研究磁场活动水平对地磁重构数据的影响,以云南省内11个地磁台站地磁记录分数据为研究对象,利用空间加权法进行数据重构,并分析Dst指数与重构数据精度之间的关系。结果表明,Dst指数绝对值与地磁数据重构精度呈明显负相关,即Dst指数绝对值越大,数据重构精度越低。当Dst>-30时,D分量重构数据与原始数据的绝对残差值小于0.05′的比例为97.1%, H、Z分量重构数据与原始数据的绝对残差值小于0.5 nT的比例分别为97.1%、97.9%,重构精度较高。当弱磁暴、中等磁暴发生时,D、H、Z三分量重构数据与原始数据的绝对残差值随Dst指数绝对值的增大而增大,重构精度减小。本研究成果可为因观测异常或记录缺失的地磁数据重构提供参考。In order to study the influence of magnetic activity level on the geomagnetic data reconstruction, this paper took minute sampling data at 11 geomagnetic stations in Yunnan Province as a research object to reconstruct geomagnetic observations by using the spatial weighting method and analyze the relationship between the accuracy of reconstructed data and the geomagnetic activity index(Dst). The results show that the accuracy of reconstructed geomagnetic data is negatively correlated with the absolute value of Dst index. When the Dst index is greater than-30(no magnetic storm), the D-component reconstructed data with an absolute error of less than 0.05 points accounts for 97.1%. The proportion of the H and Z components reconstructed data with an absolute error of less than 0.5 nT is 97.1% and 97.9%, respectively, indicating a high reconstruction accuracy. When weak or moderate magnetic storms occur, the absolute errors of the reconstructed data for D, H, and Z components increase with the increase of the absolute value of the Dst index, giving a low reconstruction accuracy. The results in this paper can provide references for the reconstruction of geomagnetic data due to abnormal observations or missing records.

关 键 词：地磁数据 空间加权法 数据重构 DST指数 

分 类 号：P318.6[天文地球—固体地球物理学]