Abstract:
:The dominant dipolar component of the Earth's magnetic field has been steadily weakening for at least the last 170 years. Prior to these direct measurements, archaeomagnetic records show short periods of significantly elevated geomagnetic intensity. These striking phenomena are not captured by current field models and their relationship to the recent dipole decay is highly unclear. Here we apply a novel multi-method archaeomagnetic approach to produce a new high-quality record of geomagnetic intensity variations for Hawaii, a crucial locality in the central Pacific. It reveals a short period of high intensity occurring ~1,000 years ago, qualitatively similar to behaviour observed 200 years earlier in Europe and 500 years later in Mesoamerica. We combine these records with one from Japan to produce a coherent picture that includes the dipole decaying steadily over the last millennium. Strong, regional, short-term intensity perturbations are superimposed on this global trend; their asynchronicity necessitates a highly non-dipolar nature.
journal_name
Nat Communjournal_title
Nature communicationsauthors
de Groot LV,Biggin AJ,Dekkers MJ,Langereis CG,Herrero-Bervera Edoi
10.1038/ncomms3727subject
Has Abstractpub_date
2013-01-01 00:00:00pages
2727issn
2041-1723pii
ncomms3727journal_volume
4pub_type
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