Geomagnetic observations on Tristan da Cunha, South Atlantic Ocean

Few geomagnetic ground observations exist of the Earth’s strongest core field anomaly, the South Atlantic Anomaly(SAA). The geomagnetic repeat station on the island Tristan da Cunha, located half-way between South Africaand South America at 37° 05’ S, 12° 18’ W, is therefore of crucial importance. W...

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Bibliographic Details
Published in:Annals of Geophysics
Main Authors: Matzka, Jürgen, Olsen, Nils, Fox Maule, Cathrine, Pedersen, Lars William, Berarducci, Alan M., Macmillan, Susan
Format: Article in Journal/Newspaper
Language:English
Published: Istituto Nazionale di Geofisica e Vulcanologia, INGV 2009
Subjects:
South Atlantic Anomaly – geomagnetic observatory – geomagnetic repeat station – Tristan da Cunha
Tristan
South Atlantic Ocean
Online Access:https://www.annalsofgeophysics.eu/index.php/annals/article/view/4633
https://doi.org/10.4401/ag-4633
Description
Summary:Few geomagnetic ground observations exist of the Earth’s strongest core field anomaly, the South Atlantic Anomaly(SAA). The geomagnetic repeat station on the island Tristan da Cunha, located half-way between South Africaand South America at 37° 05’ S, 12° 18’ W, is therefore of crucial importance. We have conducted several sets ofrepeat station measurements during magnetically quiet conditions (Kp 2o or less) in 2004. The procedures are describedand the results are compared to those from earlier campaigns and to the predictions of various global fieldmodels. Features of the local crustal bias field and the solar quiet daily variation are discussed. We also evaluatethe benefit of continuous magnetic field recordings from Tristan da Cunha, and argue that such a data set is a veryvaluable addition to geomagnetic satellite data. Recently, funds were set up to establish and operate a magnetometerstation on Tristan da Cunha during the Swarm magnetic satellite mission (2011-2014).

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