Globally strong geomagnetic field intensity circa 3000 years ago

Hoabin Hong, Yongjae Yu, Chan Hee Lee, Ran Hee Kim, Jingyu Park, Seong Jae Doh, Wonnyon Kim, Hyongmi Sung

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

High-fidelity geomagnetic field intensity determination was carried out using 191 baked fragments collected from 20 kilns or hearths with ages ranging between ~1200 BC and ~AD 1725 in South Korea. Geomagnetic field intensity variation displayed three narrow minima at ~800-700 BC, ~AD 700, and ~AD 1600 and two maxima at ~1200-1100 BC and ~AD 1000-1100. In most time intervals, virtual axial dipole moment (VADM) variation is confined within 20% of the present VADM. However, geomagnetic field intensity circa 3000 yr ago is nearly 40% larger than the present value. Such high VADMs circa 3000 yr ago are in phase with those in other longitudinal bands in northern hemisphere centered at 5E (France), 30E (the Middle East) and 200E (Hawaii). Although strong geomagnetic field intensity circa 3000 yr ago is globally synchronous, the highest VADM occurs at slightly different time intervals in different locations. Hence it is possible that the globally strong geomagnetic field intensity circa 3000 yr ago reflects the migration of persistent hemispheric flux in northern hemisphere or an episode of geomagnetic field hemispheric asymmetry.

Original languageEnglish
Pages (from-to)142-152
Number of pages11
JournalEarth and Planetary Science Letters
Volume383
DOIs
Publication statusPublished - 2013 Dec 1

Keywords

  • Archeomagnetism
  • Dipolar field
  • Non-dipolar field
  • Paleointensity
  • Secular variation
  • Strong geomagnetic field intensity

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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