A global mantle conductivity model derived from 8 years of Swarm satellite magnetic data  

作　　者：HongBo Yao ZhengYong Ren KeJia Pan JingTian Tang KeKe Zhang 

机构地区：[1]Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education(Central South University),Changsha 410083,China [2]Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration,Central South University,Changsha 410083,China [3]School of Geosciences and Info-Physics,Central South University,Changsha 410083,China [4]School of Mathematics and Statistics,Central South University,Changsha 410083,China [5]State Key Laboratory of Lunar and Planetary Sciences,Macao University of Science and Technology,Taipa,Macao,China

出　　处：《Earth and Planetary Physics》2023年第1期49-56,共8页地球与行星物理（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(41922027,41830107,42142034,41874086);Innovation-Driven Project of Central South University(2020CX012);Macao Foundation;Macao Science and Technology Development Fund(0001/2019/A1);the Pre-research Project on Civil Aerospace Technologies funded by China National Space Administration(D020303);the Hunan Provincial Innovation Foundation for Postgraduate(CX20210277);the Fundamental Research Funds for the Central Universities of Central South University(2021zzts0259)。

摘　　要：Mantle conductivity imaging is one of the scientific goals of the forthcoming Macao Science Satellite-1(MSS-1).To achieve this goal,we develop a data analysis and inversion scheme for satellite magnetic data to probe global one-dimensional(1D)mantle conductivity structures.Using this scheme,we present a new global mantle conductivity model by analyzing over 8 years of Swarm satellite magnetic data.First,after sophisticated data selection procedures and the removal of core and crustal fields,the inducing and induced spherical harmonic coefficients of magnetic potential due to the magnetospheric ring current are derived.Second,satellite Cresponses are estimated from the time series of these coefficients.Finally,the observed responses are inverted for both smooth and threejump conductivity models using a quasi-Newton algorithm.The obtained conductivity models are in general agreement with previous global mantle conductivity models.A comparison of our conductivity model with the laboratory conductivity model suggests the mean state of the upper mantle and transition zone is relatively dry.This scheme can be used to process the forthcoming Macao Science Satellite-1 magnetic data.

关 键 词：Macao Science Satellite-1 satellite magnetic data mantle conductivity global electromagnetic induction 

分 类 号：P228[天文地球—大地测量学与测量工程]