A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission
The current work makes use of the geometrical configuration of the two lower-altitude Swarm satellites (Swarm A and C), moving side by side with a longitudinal distance of 1.4°, to estimate a two-dimensional (2D) model of the lithospheric magnetic anomaly field over Egypt using gradient data. The gr...
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MDPI AG
2022-10-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/8/10/530 |
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| author | Asmaa Abdellatif Essam Ghamry Mohamed Sobh Adel Fathy |
| author_facet | Asmaa Abdellatif Essam Ghamry Mohamed Sobh Adel Fathy |
| author_sort | Asmaa Abdellatif |
| collection | DOAJ |
| description | The current work makes use of the geometrical configuration of the two lower-altitude Swarm satellites (Swarm A and C), moving side by side with a longitudinal distance of 1.4°, to estimate a two-dimensional (2D) model of the lithospheric magnetic anomaly field over Egypt using gradient data. The gradient in both the north–south and the east–west directions have been inverted using the weighted damping least-squares fit technique to estimate the best model coefficients of the 2D model. The best model coefficients have been obtained under the expansion of the Legendre polynomial from degree <i>n</i> = 7 to <i>n</i> = 56. Results showed that the gradient of the field in the north–south direction is always much smoother than that in the east–west direction. The noise in the east–west direction is attributed to the different environmental conditions surrounding both satellites. The modeled field always showed smoother variations than the observed data, even for the horizontal components (<i><b>B</b><sub>x</sub></i> and <i><b>B</b><sub>y</sub></i>). |
| first_indexed | 2024-03-09T19:25:07Z |
| format | Article |
| id | doaj.art-ab6c94aa7e8c419985cb5588a1787f7e |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T19:25:07Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-ab6c94aa7e8c419985cb5588a1787f7e2023-11-24T03:01:49ZengMDPI AGUniverse2218-19972022-10-0181053010.3390/universe8100530A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm MissionAsmaa Abdellatif0Essam Ghamry1Mohamed Sobh2Adel Fathy3Physics Department, Faculty of Science, Fayoum University, Fayoum 63514, EgyptNational Research Institute of Astronomy and Geophysics (NRIAG), Helwan 11421, EgyptNational Research Institute of Astronomy and Geophysics (NRIAG), Helwan 11421, EgyptPhysics Department, Faculty of Science, Fayoum University, Fayoum 63514, EgyptThe current work makes use of the geometrical configuration of the two lower-altitude Swarm satellites (Swarm A and C), moving side by side with a longitudinal distance of 1.4°, to estimate a two-dimensional (2D) model of the lithospheric magnetic anomaly field over Egypt using gradient data. The gradient in both the north–south and the east–west directions have been inverted using the weighted damping least-squares fit technique to estimate the best model coefficients of the 2D model. The best model coefficients have been obtained under the expansion of the Legendre polynomial from degree <i>n</i> = 7 to <i>n</i> = 56. Results showed that the gradient of the field in the north–south direction is always much smoother than that in the east–west direction. The noise in the east–west direction is attributed to the different environmental conditions surrounding both satellites. The modeled field always showed smoother variations than the observed data, even for the horizontal components (<i><b>B</b><sub>x</sub></i> and <i><b>B</b><sub>y</sub></i>).https://www.mdpi.com/2218-1997/8/10/530Swarm satellitesinverse theorylithospheric magnetic anomaly fieldLegendre polynomialEgypt |
| spellingShingle | Asmaa Abdellatif Essam Ghamry Mohamed Sobh Adel Fathy A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission Universe Swarm satellites inverse theory lithospheric magnetic anomaly field Legendre polynomial Egypt |
| title | A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission |
| title_full | A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission |
| title_fullStr | A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission |
| title_full_unstemmed | A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission |
| title_short | A 2D Lithospheric Magnetic Anomaly Field over Egypt Using Gradient Data of Swarm Mission |
| title_sort | 2d lithospheric magnetic anomaly field over egypt using gradient data of swarm mission |
| topic | Swarm satellites inverse theory lithospheric magnetic anomaly field Legendre polynomial Egypt |
| url | https://www.mdpi.com/2218-1997/8/10/530 |
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