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 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.
authors.affiliation: Laboratoire de Physique Statistique, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, Paris, France.
authors.forename: B
authors.initials: B
authors.lastname: Gallet
authors.forename: S
authors.initials: S
authors.lastname: Aumaître
authors.forename: J
authors.initials: J
authors.lastname: Boisson
authors.forename: F
authors.initials: F
authors.lastname: Daviaud
authors.forename: B
authors.initials: B
authors.lastname: Dubrulle
authors.forename: N
authors.initials: N
authors.lastname: Bonnefoy
authors.forename: M
authors.initials: M
authors.lastname: Bourgoin
authors.forename: Ph
authors.initials: P
authors.lastname: Odier
authors.forename: J-F
authors.initials: JF
authors.lastname: Pinton
authors.forename: N
authors.initials: N
authors.lastname: Plihon
authors.forename: G
authors.initials: G
authors.lastname: Verhille
authors.forename: S
authors.initials: S
authors.lastname: Fauve
authors.forename: F
authors.initials: F
authors.lastname: Pétrélis