A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites

作     者：Adel Fathy Essam Ghamry Adel Fathy;Essam Ghamry

作者机构：Physics DepartmentFaculty of ScienceFayoum UniversityEgypt National Research Institute of Astronomy and Geophysics11421HelwanCairoEgypt 

出 版 物：《Geodesy and Geodynamics》 (大地测量与地球动力学（英文版）)

年 卷 期：2021年第12卷第3期

页      面：229-238页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

主　　题：Damped inverse theory Swarm satellites Lithospheric magnetic anomaly field Legendre polynomial Egypt 

摘      要：We use magnetic field data observed by the Swarm mission from 2014 to 2020 to construct,for the first time,a two-dimensional(2 D)lithospheric magnetic anomaly model of Egypt and its surrounding *** data during quiet geomagnetic conditions has been expanded in terms of the Legendre polynomial in harmonic terms N=*** damped least square method has been used to estimate the model coefficients based on the lithospheric magnetic *** data at two different altitudes(438-448 km and 503-511 km)were compared with the CHAOS *** exhibit that the 2 D model is superior to the CHAOS model in the capability of extracting more information about small-scale crustal anomaly *** low altitudes(438-448 km),the strength of the anomaly field increases,but the noise of the external fields has greatly reduced at high altitudes(503-511 km).Besides,the magnetic anomaly field at low altitudes has illuminated short-scale anomalies that didn’t appear at high *** the total and vertical magnetic anomaly vectors showed their ability to reveal tectonic structures compared with Moho depth map and the geological maps.