Title of article :
Globally strong geomagnetic field intensity circa 3000 years ago
Author/Authors :
Hong، نويسنده , , Hoabin and Yu، نويسنده , , Yongjae and Lee، نويسنده , , Chan-Hee and Kim، نويسنده , , Ran Hee and Park، نويسنده , , Jingyu and Doh، نويسنده , , Seong-Jae and Kim، نويسنده , , Wonnyon and Sung، نويسنده , , Hyongmi، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
11
From page :
142
To page :
152
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.
Keywords :
strong geomagnetic field intensity , paleointensity , ARCHEOMAGNETISM , Secular variation , dipolar field , non-dipolar field
Journal title :
Earth and Planetary Science Letters
Serial Year :
2013
Journal title :
Earth and Planetary Science Letters
Record number :
2332043
Link To Document :
بازگشت