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

We use magnetic field data observed by the Swarm mission from 2014 to 2020 to construct, for the first time, a two-dimensional (2D) lithospheric magnetic anomaly model of Egypt and its surrounding area. Nighttime data during quiet geomagnetic conditions has been expanded in terms of the Legendre pol...

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Main Authors: Adel Fathy, Essam Ghamry
Format: Article
Language:English
Published: KeAi Communications Co., Ltd. 2021-05-01
Series:Geodesy and Geodynamics
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S167498472100029X
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spelling doaj-21819ba0e75b4bb09de72d797fdd4d792021-07-16T04:00:38ZengKeAi Communications Co., Ltd.Geodesy and Geodynamics1674-98472021-05-01123229238A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellitesAdel Fathy0Essam Ghamry1Physics Department, Faculty of Science, Fayoum University, Egypt; Corresponding author.National Research Institute of Astronomy and Geophysics, 11421, Helwan, Cairo, EgyptWe use magnetic field data observed by the Swarm mission from 2014 to 2020 to construct, for the first time, a two-dimensional (2D) lithospheric magnetic anomaly model of Egypt and its surrounding area. Nighttime data during quiet geomagnetic conditions has been expanded in terms of the Legendre polynomial in harmonic terms N = 6–50. The damped least square method has been used to estimate the model coefficients based on the lithospheric magnetic data. Modeled data at two different altitudes (438–448 km and 503–511 km) were compared with the CHAOS model. Results exhibit that the 2D model is superior to the CHAOS model in the capability of extracting more information about small-scale crustal anomaly field. At 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 altitudes. Both the total and vertical magnetic anomaly vectors showed their ability to reveal tectonic structures compared with Moho depth map and the geological maps.http://www.sciencedirect.com/science/article/pii/S167498472100029XDamped inverse theorySwarm satellitesLithospheric magnetic anomaly fieldLegendre polynomialEgypt
collection DOAJ
language English
format Article
sources DOAJ
author Adel Fathy
Essam Ghamry
spellingShingle Adel Fathy
Essam Ghamry
A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites
Geodesy and Geodynamics
Damped inverse theory
Swarm satellites
Lithospheric magnetic anomaly field
Legendre polynomial
Egypt
author_facet Adel Fathy
Essam Ghamry
author_sort Adel Fathy
title A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites
title_short A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites
title_full A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites
title_fullStr A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites
title_full_unstemmed A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from Swarm satellites
title_sort two-dimensional lithospheric magnetic anomaly field model of egypt using the measurements from swarm satellites
publisher KeAi Communications Co., Ltd.
series Geodesy and Geodynamics
issn 1674-9847
publishDate 2021-05-01
description We use magnetic field data observed by the Swarm mission from 2014 to 2020 to construct, for the first time, a two-dimensional (2D) lithospheric magnetic anomaly model of Egypt and its surrounding area. Nighttime data during quiet geomagnetic conditions has been expanded in terms of the Legendre polynomial in harmonic terms N = 6–50. The damped least square method has been used to estimate the model coefficients based on the lithospheric magnetic data. Modeled data at two different altitudes (438–448 km and 503–511 km) were compared with the CHAOS model. Results exhibit that the 2D model is superior to the CHAOS model in the capability of extracting more information about small-scale crustal anomaly field. At 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 altitudes. Both the total and vertical magnetic anomaly vectors showed their ability to reveal tectonic structures compared with Moho depth map and the geological maps.
topic Damped inverse theory
Swarm satellites
Lithospheric magnetic anomaly field
Legendre polynomial
Egypt
url http://www.sciencedirect.com/science/article/pii/S167498472100029X
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