scholarly journals New Magnetic Anomaly Map of the Antarctic

2018 ◽  
Vol 45 (13) ◽  
pp. 6437-6449 ◽  
Author(s):  
A. V. Golynsky ◽  
F. Ferraccioli ◽  
J. K. Hong ◽  
D. A. Golynsky ◽  
R. R. B. von Frese ◽  
...  
Keyword(s):  
Magnetic Anomaly ◽  
Anomaly Map ◽  
The Antarctic

ADMAP — A Digital Magnetic Anomaly Map of the Antarctic

Antarctica ◽  
2006 ◽  
pp. 109-116 ◽  
Author(s):  
Alexander Golynsky ◽  
Massimo Chiappini ◽  
Detlef Damaske ◽  
Fausto Ferraccioli ◽  
Carol A. Finn ◽  
...  
Keyword(s):  
Magnetic Anomaly ◽  
Anomaly Map ◽  
The Antarctic

The World Digital Magnetic Anomaly Map: version 2.1

2020 ◽  
Author(s):  
Jerome Dyment ◽  
Yujin Choi ◽  
Vincent Lesur ◽  
Andreina Garcia-Reyes ◽  
Manuel Catalan ◽  
...  
Keyword(s):  
Magnetic Anomaly ◽  
International Association ◽  
Magnetic Data ◽  
International Polar Year ◽  
The World ◽  
International Polar ◽  
Geological Map ◽  
Version 2.0 ◽  
Anomaly Map ◽  
The Antarctic

<p>The World Digital Magnetic Anomaly Map (WDMAM) is an initiative of the IAGA (International Association of Geomagnetism and Aeronomy) supported by the CGMW (Commission for the Geological Map of the World) of UNESCO. The second version was released in 2015 (Dyment et al., 2015; Lesur et al., 2016), and mandate was given to the authors to update this version 2.0 using the same methodology as often as newly available data would make it necessary. Five better datasets justify the preparation and release of version 2.1: (1) the complete digital aeromagnetic map of Brasil made available to CGMW by Agência Nacional do Petróleo, Gás Natural e Biocombustíveis; (2) an improved version of the aeromagnetic map of Russia prepared at VSEGEI; (3) the second version of the Antarctic Digital Magnetic Anomaly maP (ADMAP; Golynsky et al., 2018) which construction results from a remarkable international effort during and after the Second International Polar Year; (4) a new map of the Caribbean plate and Gulf of Mexico resulting from the compilation and re-processing of existing marine and aeromagnetic data in the area (Garcia, 2018); and (5) a new compilation of marine magnetic data worldwide. The new map shows significant improvements over the previous versions and will be shortly available at wdmam.org.</p>

New model alternatives for improving the representation of the core magnetic field of Antarctica

2006 ◽  
Vol 18 (1) ◽  
pp. 101-109 ◽  
Author(s):  
Luis R. Gaya-Piqué ◽  
Dhananjay Ravat ◽  
Angelo De Santis ◽  
J. Miquel Torta
Keyword(s):  
Magnetic Field ◽  
Magnetic Anomaly ◽  
Secular Variation ◽  
Reference Model ◽  
Accurate Determination ◽  
The Core ◽  
Continuous Models ◽  
Anomaly Map ◽  
Ground Magnetic ◽  
The Antarctic

Use of the International Geomagnetic Reference Field Model (IGRF) to construct magnetic anomaly maps can lead to problems with the accurate determination of magnetic anomalies that are readily apparent at the edges of local or regional magnetic surveys carried out at different epochs. The situation is severe in areas like Antarctica, where ionospheric activity is intense and only a few ground magnetic observatories exist. This makes it difficult to properly separate from ionospheric variations the secular variation of the core magnetic field. We examine two alternatives to the piecewise-continuous IGRF core magnetic field in Antarctica for the last 45 years: the present global Comprehensive Model (CM4) and the new version of the Antarctic Reference Model (ARM). Both these continuous models are better at representing the secular variation in Antarctica than the IGRF. Therefore, their use is recommended for defining the crustal magnetic field of Antarctica (e.g. the next generation of the Antarctic Digital Magnetic Anomaly Map).

scholarly journals Mapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region

1999 ◽  
Vol 42 (2) ◽  
Author(s):  
M. E. Purucker ◽  
R. R. B. von Frese ◽  
P. T. Taylor
Keyword(s):  
Magnetic Anomaly ◽  
Magnetic Anomalies ◽  
Oceanic Lithosphere ◽  
Crustal Thickness ◽  
Time Varying ◽  
Antarctic Region ◽  
Magnetic Field Data ◽  
Anomaly Map ◽  
The Antarctic ◽  
Lateral Variations

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.

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