Spatially and Temporally Modulated Traveling-Wave Pattern in Convecting Binary Mixtures

Jay Fineberg1, Elisha Moses1, and Victor Steinberg1,2

1Department of Nuclear Physics, Weizmann Institute of Science, Rehovot, 76 100, Israel

2Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Received 10 February 1988

A new state composed of quasiperiodic traveling waves has been observed in very close vicinity of the convection onset along a stable branch. This state precedes the recently discovered confined traveling-wave state, and consists of left- and right-going traveling waves which periodically alternate between either side of the cell. A time-dependent wave-number spectrum is a characteristic feature of this pattern. Effects of pattern translation and modulational instability can qualitatively explain the observed dynamical behavior.