The Geomagnetic Non-Dipole Field in the Pacific

The core-mantle boundary below the Pacific is one of the most interesting regions for the study of the Earth's core because of the phenomena which seem to be characteristic to this region. The geomagnetic phenomeno is one of them. Two features are widely believed to exist in the geomagnetic fie...

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Bibliographic Details
Published inJournal of geomagnetism and geoelectricity Vol. 45; no. 11-12; pp. 1441 - 1453
Main Author Yukutake, Takesi
Format Journal Article Conference Proceeding
LanguageEnglish
Published Tokyo Society of Geomagnetism and Earth, Planetary and Space Sciences 01.01.1993
Terra
Subjects
Earth sciences
Earth, ocean, space
Exact sciences and technology
Internal geophysics
Solid-earth geophysics, tectonophysics, gravimetry
core
Pacific region
magnetic declination
geomagnetic field
secular variations
core-mantle boundary
magnetic inclination
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Summary:The core-mantle boundary below the Pacific is one of the most interesting regions for the study of the Earth's core because of the phenomena which seem to be characteristic to this region. The geomagnetic phenomeno is one of them. Two features are widely believed to exist in the geomagnetic field in this region. One is absence of the non-dipole field, and the other is its small secular variation, which might be related to special structures of the core-mantle boundary region below the Pacific. This paper re-examines historical data of declination, and suggests that an intense focus of the non-dipole field existed in the North Pacific in the 17th century, and concludes that the absence of the non-dipole field as seen at present has not been a permanent feature of the magnetic field in the Pacific, implying that the Pacific region is no special region in this sense.
ISSN:0022-1392
2185-5765
DOI:10.5636/jgg.45.1441