کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6429856 | 1634773 | 2013 | 11 صفحه PDF | دانلود رایگان |
- First high-fidelity archeointensity data from the Korean peninsula acquired.
- Geomagnetic field intensity circa 3000 yr ago was globally strong.
- Field intensity variation reflects the migration of persistent hemispheric flux.
High-fidelity geomagnetic field intensity determination was carried out using 191 baked fragments collected from 20 kilns or hearths with ages ranging between â¼1200 BC and â¼AD 1725 in South Korea. Geomagnetic field intensity variation displayed three narrow minima at â¼800-700 BC, â¼AD 700, and â¼AD 1600 and two maxima at â¼1200-1100 BC and â¼AD 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.
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Journal: Earth and Planetary Science Letters - Volume 383, 1 December 2013, Pages 142-152