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...
Published in: | Annals of Geophysics |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
1999
|
Subjects: | |
Online Access: | https://doi.org/10.4401/ag-3715 https://doaj.org/article/351d5ccb6df04b369042c4d47af989a9 |
id |
ftdoajarticles:oai:doaj.org/article:351d5ccb6df04b369042c4d47af989a9 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:351d5ccb6df04b369042c4d47af989a9 2023-05-15T13:57:13+02:00 Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region P. T. Taylor R. R. B. von Frese M. E. Purucker 1999-06-01T00:00:00Z https://doi.org/10.4401/ag-3715 https://doaj.org/article/351d5ccb6df04b369042c4d47af989a9 EN eng Istituto Nazionale di Geofisica e Vulcanologia (INGV) http://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-3715 1593-5213 2037-416X https://doaj.org/article/351d5ccb6df04b369042c4d47af989a9 Annals of Geophysics, Vol 42, Iss 2 (1999) Antarctic geomagnetic field magnetic field satellites magnetic anomalies Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 article 1999 ftdoajarticles https://doi.org/10.4401/ag-3715 2022-12-31T13:10:25Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Annals of Geophysics 42 2 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic geomagnetic field magnetic field satellites magnetic anomalies Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Antarctic geomagnetic field magnetic field satellites magnetic anomalies Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 P. T. Taylor R. R. B. von Frese M. E. Purucker Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region |
topic_facet |
Antarctic geomagnetic field magnetic field satellites magnetic anomalies Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
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 |
P. T. Taylor R. R. B. von Frese M. E. Purucker |
author_facet |
P. T. Taylor R. R. B. von Frese M. E. Purucker |
author_sort |
P. T. Taylor |
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://doi.org/10.4401/ag-3715 https://doaj.org/article/351d5ccb6df04b369042c4d47af989a9 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Annals of Geophysics, Vol 42, Iss 2 (1999) |
op_relation |
http://www.annalsofgeophysics.eu/index.php/annals/article/view/3715 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-3715 1593-5213 2037-416X https://doaj.org/article/351d5ccb6df04b369042c4d47af989a9 |
op_doi |
https://doi.org/10.4401/ag-3715 |
container_title |
Annals of Geophysics |
container_volume |
42 |
container_issue |
2 |
_version_ |
1766264813412941824 |