Longitude correction method for the field magnetic surveyed diurnal-variation correction  

野外磁测日变校正的经度改正方法

作　　者：Su Shu-Peng Li Bo Zhang Hai-Yang Zhao Hui-Qin and Huang Jin-Peng 苏树朋;李博;张海洋;赵慧琴(保定地震监测中心站,河北保定27100)

机构地区：[1]Baoding Central Seismic Station of Hebei Province,Baoding 071000,China [2]School of Remote Sensing and Information Engineering,Wuhan University,Wuhan 430070,China

出　　处：《Applied Geophysics》2022年第4期580-589,605,共11页应用地球物理（英文版）

基　　金：supported by The Earthquake Science and Technology Program of Hebei Province (Grant Number DZ20190422046).

摘　　要：Solar quiet daily variation(Sq)are dependent on local time.Herein,we applied the moving superposition method to separate the Sq component of correction observatory data and performed a time diff erence correction on the Sq component according to the longitudinal diff erence between the correction observatory and the field station while maintaining the time of other data components.The data were then reconstructed and used for diurnal-variation correction to improve the accuracy of the daily variations correction resu;lts The moving superposition method employs data of“nonmagnetic disturbance days”obtained 15 d before and after to perform the superposing average calculation on a daily basis,aiming to obtain the Sq of continuous morphological changes.The effect of longitude correction was tested using the observatory record and field survey data.The average correction distance of the test observatories was 2114 km,and the correction accuracies of the H(horizontal component of geomagnetic field),D(geomagnetic declination),and Z(vertical component of geomagnetic field)were improved by 28.4%,45.0%,and 21.7%,respectively;the average correction distance of the field stations was 2130 km,and the correction accuracies of the F(geomagnetic total intensity),D,I(geomagnetic inclination)components were improved by 35.2%,26.7%,and 13.9%,respectively.The test results also demonstrated that the longitude correction eff ect was greater with an increased correction distance.太阳静日变化成分(Sq)具有地方时依赖性,本文尝试应用“滑动周期叠加法”分离校正台数据中的Sq成分,然后依据校正台与测点的经度差值对Sq成分进行时间改正,并保持其它数据成分的时间不变,对台站数据进行重组。最后使用重组数据进行日变校正,提高日变校正处理结果的准确性。“滑动周期叠加法”以“天”为单位,利用其前、后各15天的“非磁扰日”数据进行叠加平均计算,以获取形态连续变化的Sq。笔者利用台站记录数据和野外测量数据对经度改正的效果进行了检测,测试台站的平均校正距离为2114km,H(地磁场水平分量)、D(磁偏角)、Z(地磁场垂直要素)三要素的校正精度分别提高了28.4%、45.0%、21.7%;野外测点的平均校正距离为2130km,F(地磁场总强度)、D、I(磁倾角)三要素的校正精度分别提高了35.2%、26.7%、13.9%。测试结果同时表明,校正距离越远,经度改正的效果越好。

关 键 词：Field geomagnetic survey diurnal-variation correction component decomposition SQ longitude correction 

分 类 号：P318.63[天文地球—固体地球物理学] P315.721[天文地球—地球物理学]