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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Multidecadally resolved polarity oscillations during a geomagnetic excursion.

Yu-Min Chou1,2, Xiuyang Jiang3, Qingsong Liu2,4

  • 1High-Precision Mass Spectrometry and Environment Change Laboratory, Department of Geosciences, National Taiwan University, 10617 Taipei, Taiwan, Republic of China; river@ntu.edu.tw chouym@sustc.edu.cn.

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|August 22, 2018
PubMed
Summary

Geomagnetic field reversals show prolonged instability, with rapid changes occurring over centuries. This new stalagmite record reveals details of Earth

Keywords:
abrupt reversal transitionasymmetrical interhemispheric polarity driftsgeomagnetic excursionmultidecadally resolved polarity oscillationsstalagmite U-Th dating

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Area of Science:

  • Paleomagnetism
  • Geophysics
  • Earth Science

Background:

  • Geomagnetic field reversals are a natural phenomenon throughout Earth's history.
  • Understanding the behavior of the geomagnetic field during reversals and excursions is crucial but remains poorly understood.

Purpose of the Study:

  • To present a high-resolution record of a geomagnetic excursion.
  • To investigate the transitional behavior of the geomagnetic field during reversals.

Main Methods:

  • Utilized a radioisotopically dated Chinese stalagmite.
  • Achieved multidecadally resolved geomagnetic excursion record with age precision of several decades.
  • Analyzed geomagnetic directional oscillations and reversal transition durations.

Main Results:

  • Documented geomagnetic directional oscillations lasting centuries to millennia between 107-91 thousand years before present.
  • Observed an abrupt reversal transition within one to two centuries when the geomagnetic field was weakest.
  • Identified prolonged geodynamo instability and repeated asymmetrical interhemispheric polarity drifts.

Conclusions:

  • The findings indicate prolonged instability in Earth's geodynamo.
  • Weak dipole fields and rapid polarity changes likely originate from Earth's deep interior.
  • Future rapid geomagnetic changes could significantly impact technology and society.