Ascension and Port Stanley geomagnetic observatories and monitoring the South Atlantic anomaly

Macmillan, Susan; Turbitt, Christopher; Thomson, Alan. 2009 Ascension and Port Stanley geomagnetic observatories and monitoring the South Atlantic anomaly. Annals of Geophysics, 52 (1). 83-96. 10.4401/ag-4632

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Abstract/Summary

Our 15-year experience of operating two remote observatories, Ascension and Port Stanley, in the south Atlantic is described. These observatories help monitor the South Atlantic Anomaly (SAA), a region of weak magnetic field which causes considerable problems for spacecraft operators. One-minute and one-second values from these observatories, and other observatories both inside and outside the SAA, are analysed. We investigate whether the SAA, and its growth over time, are having any tangible effect on the observed external field variations. Whilst only able to illustrate the long-term characteristics of the irregular external field related to the solar cycle and not due to any long-term changes in the internal field, we do isolate micropulsation signals at sites inside the SAA which contain more power than at sites outside.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.4401/ag-4632
Programmes:	BGS Programmes 2009 > Earth hazards and systems
ISSN:	1593-5213
NORA Subject Terms:	Earth Sciences
Date made live:	14 Jul 2009 10:53 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/7483

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