title: Chaos-induced resistivity in the magnetic null region: a nonlinear mechanism of collisionless dissipation.
abstract: Magnetic null points act as scattering centers where particles describe chaotic orbits, and the mixing effect brings about increase of the kinetic entropy. The resultant "chaos-induced resistivity" may explain anomalous diffusion of current in magnetic null regions [Phys. Rev. Lett. 88, 045003 (2002)], which can be much larger than the conventional collisionless resistivity in a high temperature plasma. To study the statistical properties of the system (such as Lyapunov exponents and distribution functions), strong spatial inhomogeneity of the system has been studied to specify the responsible "chaos region."
authors.affiliation: Graduate School of Frontier Sciences, University of Tokyo, Hongo, Tokyo 113-0033, Japan. numata@plasma.q.t.u-tokyo.ac.jp
authors.forename: Ryusuke
authors.initials: R
authors.lastname: Numata
authors.forename: Zensho
authors.initials: Z
authors.lastname: Yoshida