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Ascension Island Magnetic Observatory

Photo of Ascension Island Observatory Photo of Ascension Island Observatory absolute observation pillar
Name Ascension Island
Location Ascension Island, Atlantic Ocean
Latitude 7.949° S
Longitude 345.624° E
Elevation 177m
Geomagnetic Latitude 2.956° S
Geomagnetic Longitude 57.539° E
Orientation HDZF
In Operation since: 1992
INTERMAGNET member since: 2003

Geomagnetic coordinates are approximations calculated using the 13th generation IGRF at epoch 2020.5.


The Ascension Island magnetic observatory is situated 40m outside the perimeter fence of the Cable and Wireless Earth Station, Donkey Plain, on the south-west side of the site.

The observatory was installed by the British Geological Survey with financial support from a consortium of oil companies and became operational in September 1992.

We also support the operation of a British Antarctic Survey VLF Radio Wave Detector as part of a worldwide network of lightning detectors.

Ascension Island magnetic observatory is part of the INTERMAGNET network.