Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals

F.H. Busse; R.D. Simitev

doi:10.1016/j.pepi.2008.06.007

Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals

F.H. Busse, R.D. Simitev

Research output: Contribution to journal › Letter, comment/opinion or interview › peer-review

Abstract

It is proposed that convection driven dynamos operating in planetary cores could be oscillatory even when the oscillations are not directly noticeable from the outside. Examples of dynamo simulations are pointed out that exhibit oscillations in the structure of the azimuthally averaged toroidal magnetic flux while the mean poloidal field shows only variations in its amplitude. In the case of the geomagnetic field, global excursions may be associated with these oscillations. Long period dynamo simulations indicate that the oscillations may cause reversals once in a while. No special attempt has been made to use most realistic parameter values. Nevertheless some similarities between the simulations and the paleomagnetic record can be pointed out. Crown

Original language	English
Pages (from-to)	237-243
Number of pages	7
Journal	Physics of the Earth and Planetary Interiors
Volume	168
Issue number	3-4
DOIs	https://doi.org/10.1016/j.pepi.2008.06.007
Publication status	Published - Jul 2008

Bibliographical note

Keywords

geodynamo
excursions
reversal
dynamo oscillations

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10.1016/j.pepi.2008.06.007

Toroidal Flux Oscillations as Possible Causes of Geomagnetic Excursions and Reversals
© 2009, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 1.62 MBLicence: CC BY-NC-ND 3.0

Cite this

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title = "Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals",

abstract = "It is proposed that convection driven dynamos operating in planetary cores could be oscillatory even when the oscillations are not directly noticeable from the outside. Examples of dynamo simulations are pointed out that exhibit oscillations in the structure of the azimuthally averaged toroidal magnetic flux while the mean poloidal field shows only variations in its amplitude. In the case of the geomagnetic field, global excursions may be associated with these oscillations. Long period dynamo simulations indicate that the oscillations may cause reversals once in a while. No special attempt has been made to use most realistic parameter values. Nevertheless some similarities between the simulations and the paleomagnetic record can be pointed out. Crown",

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T1 - Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals

AU - Busse, F.H.

AU - Simitev, R.D.

PY - 2008/7

Y1 - 2008/7

N2 - It is proposed that convection driven dynamos operating in planetary cores could be oscillatory even when the oscillations are not directly noticeable from the outside. Examples of dynamo simulations are pointed out that exhibit oscillations in the structure of the azimuthally averaged toroidal magnetic flux while the mean poloidal field shows only variations in its amplitude. In the case of the geomagnetic field, global excursions may be associated with these oscillations. Long period dynamo simulations indicate that the oscillations may cause reversals once in a while. No special attempt has been made to use most realistic parameter values. Nevertheless some similarities between the simulations and the paleomagnetic record can be pointed out. Crown

AB - It is proposed that convection driven dynamos operating in planetary cores could be oscillatory even when the oscillations are not directly noticeable from the outside. Examples of dynamo simulations are pointed out that exhibit oscillations in the structure of the azimuthally averaged toroidal magnetic flux while the mean poloidal field shows only variations in its amplitude. In the case of the geomagnetic field, global excursions may be associated with these oscillations. Long period dynamo simulations indicate that the oscillations may cause reversals once in a while. No special attempt has been made to use most realistic parameter values. Nevertheless some similarities between the simulations and the paleomagnetic record can be pointed out. Crown

KW - geodynamo

KW - excursions

KW - reversal

KW - dynamo oscillations

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U2 - 10.1016/j.pepi.2008.06.007

DO - 10.1016/j.pepi.2008.06.007

M3 - Letter, comment/opinion or interview

AN - SCOPUS:49749109099

SN - 0031-9201

VL - 168

SP - 237

EP - 243

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

IS - 3-4

ER -

Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals

Abstract

Bibliographical note

Keywords

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