title: Experimental evidence of a zonal magnetic field in a toroidal plasma.
abstract: A zonal magnetic field is found in a toroidal plasma. The magnetic field has a symmetric bandlike structure, which is uniform in the toroidal and poloidal directions and varies radially with a finite wavelength of mesoscale, which is analogous to zonal flows. A time-dependent bicoherence analysis reveals that the magnetic field should be generated by the background plasma turbulence. The discovery is classified as a new kind of phenomenon of structured magnetic field generation, giving insight into phenomena such as dipole field generation in rotational planets.
authors.affiliation: National Institute for Fusion Science, Oroshi-cho, Toki-shi 509-52, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Fujisawa
authors.forename: K
authors.initials: K
authors.lastname: Itoh
authors.forename: A
authors.initials: A
authors.lastname: Shimizu
authors.forename: H
authors.initials: H
authors.lastname: Nakano
authors.forename: S
authors.initials: S
authors.lastname: Ohshima
authors.forename: H
authors.initials: H
authors.lastname: Iguchi
authors.forename: K
authors.initials: K
authors.lastname: Matsuoka
authors.forename: S
authors.initials: S
authors.lastname: Okamura
authors.forename: T
authors.initials: T
authors.lastname: Minami
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshimura
authors.forename: K
authors.initials: K
authors.lastname: Nagaoka
authors.forename: K
authors.initials: K
authors.lastname: Ida
authors.forename: K
authors.initials: K
authors.lastname: Toi
authors.forename: C
authors.initials: C
authors.lastname: Takahashi
authors.forename: M
authors.initials: M
authors.lastname: Kojima
authors.forename: S
authors.initials: S
authors.lastname: Nishimura
authors.forename: M
authors.initials: M
authors.lastname: Isobe
authors.forename: C
authors.initials: C
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Akiyama
authors.forename: Y
authors.initials: Y
authors.lastname: Nagashima
authors.forename: S-I
authors.initials: SI
authors.lastname: Itoh
authors.forename: P H
authors.initials: PH
authors.lastname: Diamond