Experimental observation of spatially localized dynamo magnetic fields

B. Gallet; S. Aumaître; J. Boisson; F. Daviaud; B. Dubrulle; N. Bonnefoy; M. Bourgoin; Ph Odier; J. F. Pinton; N. Plihon; G. Verhille; S. Fauve; F. Pétrélis

doi:10.1103/PhysRevLett.108.144501

Experimental observation of spatially localized dynamo magnetic fields

B. Gallet
, S. Aumaître
, J. Boisson
, F. Daviaud
, B. Dubrulle
, N. Bonnefoy
, M. Bourgoin
, Ph Odier
, J. F. Pinton
, N. Plihon
, G. Verhille
, S. Fauve
, F. Pétrélis

Research output: Contribution to journal › Article › peer-review

Abstract

We report the first experimental observation of a spatially localized dynamo magnetic field, a common feature of astrophysical dynamos and convective dynamo simulations. When the two propellers of the von Kármán sodium experiment are driven at frequencies that differ by 15%, the mean magnetic field's energy measured close to the slower disk is nearly 10 times larger than the one close to the faster one. This strong localization of the magnetic field when a symmetry of the forcing is broken is in good agreement with a prediction based on the interaction between a dipolar and a quadrupolar magnetic mode.

Original language	English
Article number	144501
Journal	Physical Review Letters
Volume	108
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.108.144501
Publication status	Published - 2 Apr 2012
Externally published	Yes

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10.1103/PhysRevLett.108.144501

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title = "Experimental observation of spatially localized dynamo magnetic fields",

abstract = "We report the first experimental observation of a spatially localized dynamo magnetic field, a common feature of astrophysical dynamos and convective dynamo simulations. When the two propellers of the von K{\'a}rm{\'a}n sodium experiment are driven at frequencies that differ by 15\%, the mean magnetic field's energy measured close to the slower disk is nearly 10 times larger than the one close to the faster one. This strong localization of the magnetic field when a symmetry of the forcing is broken is in good agreement with a prediction based on the interaction between a dipolar and a quadrupolar magnetic mode.",

author = "B. Gallet and S. Auma{\^i}tre and J. Boisson and F. Daviaud and B. Dubrulle and N. Bonnefoy and M. Bourgoin and Ph Odier and Pinton, \{J. F.\} and N. Plihon and G. Verhille and S. Fauve and F. P{\'e}tr{\'e}lis",

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AU - Gallet, B.

AU - Aumaître, S.

AU - Boisson, J.

AU - Daviaud, F.

AU - Dubrulle, B.

AU - Bonnefoy, N.

AU - Bourgoin, M.

AU - Odier, Ph

AU - Pinton, J. F.

AU - Plihon, N.

AU - Verhille, G.

AU - Fauve, S.

AU - Pétrélis, F.

PY - 2012/4/2

Y1 - 2012/4/2

N2 - We report the first experimental observation of a spatially localized dynamo magnetic field, a common feature of astrophysical dynamos and convective dynamo simulations. When the two propellers of the von Kármán sodium experiment are driven at frequencies that differ by 15%, the mean magnetic field's energy measured close to the slower disk is nearly 10 times larger than the one close to the faster one. This strong localization of the magnetic field when a symmetry of the forcing is broken is in good agreement with a prediction based on the interaction between a dipolar and a quadrupolar magnetic mode.

AB - We report the first experimental observation of a spatially localized dynamo magnetic field, a common feature of astrophysical dynamos and convective dynamo simulations. When the two propellers of the von Kármán sodium experiment are driven at frequencies that differ by 15%, the mean magnetic field's energy measured close to the slower disk is nearly 10 times larger than the one close to the faster one. This strong localization of the magnetic field when a symmetry of the forcing is broken is in good agreement with a prediction based on the interaction between a dipolar and a quadrupolar magnetic mode.

U2 - 10.1103/PhysRevLett.108.144501

DO - 10.1103/PhysRevLett.108.144501

M3 - Article

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SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 144501

ER -

Experimental observation of spatially localized dynamo magnetic fields

Abstract

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