Electromagnetic core‐mantle coupling and paleomagnetic reversal paths
Calculations of electromagnetic torques between the fluid outer core and the heterogeneous lower mantle demonstrate that the geomagnetic field can lock with the mantle during polarity transitions. We show that the Virtual Geomagnetic Pole (VGP) is attracted toward mantle regions with low electrical...
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1996
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ftcdlib:oai:escholarship.org:ark:/13030/qt1v63406b 2023-06-11T04:11:49+02:00 Electromagnetic core‐mantle coupling and paleomagnetic reversal paths Aurnou, JM Buttles, JL Neumann, GA Olson, PL 2705 - 2708 1996-09-15 application/pdf https://escholarship.org/uc/item/1v63406b unknown eScholarship, University of California qt1v63406b https://escholarship.org/uc/item/1v63406b public Geophysical Research Letters, vol 23, iss 19 Meteorology & Atmospheric Sciences article 1996 ftcdlib 2023-05-29T17:59:10Z Calculations of electromagnetic torques between the fluid outer core and the heterogeneous lower mantle demonstrate that the geomagnetic field can lock with the mantle during polarity transitions. We show that the Virtual Geomagnetic Pole (VGP) is attracted toward mantle regions with low electrical conductivity and repelled from mantle regions with high conductivity. Using seismically-determined structure of the lower mantle to infer the pattern of conductivity variations at the base of the mantle, we find two preferred reversal routes for the VGP, one beneath the Americas and another beneath Asia. These paths, particularly the one beneath the Americas, lie close to the VGP paths seen in some sedimentary and lava records of polarity reversals, suggesting that the core and mantle are electromagnetically coupled during reversals. Copyright 1996 by the American Geophysical Union. Article in Journal/Newspaper Geomagnetic Pole University of California: eScholarship |
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Open Polar |
collection |
University of California: eScholarship |
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ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Aurnou, JM Buttles, JL Neumann, GA Olson, PL Electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
Calculations of electromagnetic torques between the fluid outer core and the heterogeneous lower mantle demonstrate that the geomagnetic field can lock with the mantle during polarity transitions. We show that the Virtual Geomagnetic Pole (VGP) is attracted toward mantle regions with low electrical conductivity and repelled from mantle regions with high conductivity. Using seismically-determined structure of the lower mantle to infer the pattern of conductivity variations at the base of the mantle, we find two preferred reversal routes for the VGP, one beneath the Americas and another beneath Asia. These paths, particularly the one beneath the Americas, lie close to the VGP paths seen in some sedimentary and lava records of polarity reversals, suggesting that the core and mantle are electromagnetically coupled during reversals. Copyright 1996 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Aurnou, JM Buttles, JL Neumann, GA Olson, PL |
author_facet |
Aurnou, JM Buttles, JL Neumann, GA Olson, PL |
author_sort |
Aurnou, JM |
title |
Electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
title_short |
Electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
title_full |
Electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
title_fullStr |
Electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
title_full_unstemmed |
Electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
title_sort |
electromagnetic core‐mantle coupling and paleomagnetic reversal paths |
publisher |
eScholarship, University of California |
publishDate |
1996 |
url |
https://escholarship.org/uc/item/1v63406b |
op_coverage |
2705 - 2708 |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_source |
Geophysical Research Letters, vol 23, iss 19 |
op_relation |
qt1v63406b https://escholarship.org/uc/item/1v63406b |
op_rights |
public |
_version_ |
1768387142914932736 |