Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region
A satellite magnetic anomaly map made using the POGO magnetic field data is compared to three maps made using Magsat data. A total of 14 anomalies with magnitudes greater than 3 nT can be identified in all four of the maps poleward of 60°S latitude. Forward models of the Antarctic continental and oc...
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Istituto Nazionale di Geofisica e Vulcanologia, INGV
1999
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Online Access: | https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 https://doi.org/10.4401/ag-3715 |
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ftjaog:oai:ojs.annalsofgeophysics.eu:article/3715 2023-05-15T13:54:52+02:00 Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region Purucker, M. E. von Frese, R. R. B. Taylor, P. T. 1999-11-25 application/pdf https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 https://doi.org/10.4401/ag-3715 eng eng Istituto Nazionale di Geofisica e Vulcanologia, INGV https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715/3779 https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 doi:10.4401/ag-3715 Annals of Geophysics; V. 42 N. 2 (1999) Annals of Geophysics; Vol. 42 No. 2 (1999) 2037-416X 1593-5213 Antarctic geomagnetic field magnetic field satellites magnetic anomalies 04.05.04. Magnetic anomalies info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1999 ftjaog https://doi.org/10.4401/ag-3715 2022-03-27T06:36:31Z A satellite magnetic anomaly map made using the POGO magnetic field data is compared to three maps made using Magsat data. A total of 14 anomalies with magnitudes greater than 3 nT can be identified in all four of the maps poleward of 60°S latitude. Forward models of the Antarctic continental and oceanic lithosphere are produced which use magnetic crustal thickness based on seismic and heat flow data, and which also use the distribution of the Cretaceous Quiet Zone from marine geophysics. These simple models can explain significant parts of eight of the 14 identified anomalies. The remaining anomalies may be caused by lateral variations of magnetization, inadequate models of the magnetic crustal thickness, or remanent magnetizations in directions other than the present field. In addition, contamination of the magnetic anomaly maps by fields of time-varying external origin (and their corresponding internal parts) is still a significant problem in the Antarctic region. Article in Journal/Newspaper Antarc* Antarctic Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) Antarctic The Antarctic Annals of Geophysics 42 2 |
institution |
Open Polar |
collection |
Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftjaog |
language |
English |
topic |
Antarctic geomagnetic field magnetic field satellites magnetic anomalies 04.05.04. Magnetic anomalies |
spellingShingle |
Antarctic geomagnetic field magnetic field satellites magnetic anomalies 04.05.04. Magnetic anomalies Purucker, M. E. von Frese, R. R. B. Taylor, P. T. Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
topic_facet |
Antarctic geomagnetic field magnetic field satellites magnetic anomalies 04.05.04. Magnetic anomalies |
description |
A satellite magnetic anomaly map made using the POGO magnetic field data is compared to three maps made using Magsat data. A total of 14 anomalies with magnitudes greater than 3 nT can be identified in all four of the maps poleward of 60°S latitude. Forward models of the Antarctic continental and oceanic lithosphere are produced which use magnetic crustal thickness based on seismic and heat flow data, and which also use the distribution of the Cretaceous Quiet Zone from marine geophysics. These simple models can explain significant parts of eight of the 14 identified anomalies. The remaining anomalies may be caused by lateral variations of magnetization, inadequate models of the magnetic crustal thickness, or remanent magnetizations in directions other than the present field. In addition, contamination of the magnetic anomaly maps by fields of time-varying external origin (and their corresponding internal parts) is still a significant problem in the Antarctic region. |
format |
Article in Journal/Newspaper |
author |
Purucker, M. E. von Frese, R. R. B. Taylor, P. T. |
author_facet |
Purucker, M. E. von Frese, R. R. B. Taylor, P. T. |
author_sort |
Purucker, M. E. |
title |
Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
title_short |
Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
title_full |
Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
title_fullStr |
Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
title_full_unstemmed |
Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
title_sort |
mapping and interpretation of satellite magnetic anomalies from pogo data over the antarctic region |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia, INGV |
publishDate |
1999 |
url |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 https://doi.org/10.4401/ag-3715 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Annals of Geophysics; V. 42 N. 2 (1999) Annals of Geophysics; Vol. 42 No. 2 (1999) 2037-416X 1593-5213 |
op_relation |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715/3779 https://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 doi:10.4401/ag-3715 |
op_doi |
https://doi.org/10.4401/ag-3715 |
container_title |
Annals of Geophysics |
container_volume |
42 |
container_issue |
2 |
_version_ |
1766261008799629312 |