title: Magnetospheric vortex formation: self-organized confinement of charged particles.
abstract: A magnetospheric configuration gives rise to various peculiar plasma phenomena that pose conundrums to astrophysical studies; at the same time, innovative technologies may draw on the rich physics of magnetospheric plasmas. We have created a "laboratory magnetosphere" with a levitating superconducting ring magnet. Here we show that charged particles (electrons) self-organize a stable vortex, in which particles diffuse inward to steepen the density gradient. The rotating electron cloud is sustained for more than 300 s. Because of its simple geometry and self-organization, this system will have wide applications in confining single- and multispecies charged particles.
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
authors.forename: Z
authors.initials: Z
authors.lastname: Yoshida
authors.forename: H
authors.initials: H
authors.lastname: Saitoh
authors.forename: J
authors.initials: J
authors.lastname: Morikawa
authors.forename: Y
authors.initials: Y
authors.lastname: Yano
authors.forename: S
authors.initials: S
authors.lastname: Watanabe
authors.forename: Y
authors.initials: Y
authors.lastname: Ogawa