title: Unusual spiral wave tip trajectories in a parametrically forced nonequilibrium system.
abstract: The effect of parametric modulations on spiral waves that form in a thin layer of liquid crystal under rotating magnetic field is studied in laboratory experiments and numerical simulations. Parametric forcings that are sinusoidal in time make a simply rotating spiral tip to meander, rendering a compound tip trajectory that is composed of a main circular orbit and a satellite orbit with an unusual crescent shape. No evidence of frequency locking is found. The underlying mechanism for the unusual shape of the satellite orbit is elucidated, and the dependence of the rotation frequency of the main circular orbit f(o) on the perturbation parameters are discussed.
authors: National Creative Research Initiative Center for Neurodynamics and Department of Physics, Korea University, Seoul 136-701, Korea.
authors: Jysoo
authors: J
authors: Lee
authors: Jinha
authors: J
authors: Kim
authors: Goen-hee
authors: GH
authors: Yi
authors: Kyoung J
authors: KJ
authors: Lee