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Transition from confined to extended traveling waves in a convective binary mixture.

Experimental evidence of two distinctive mechanisms of transition from localized (LTW) to extended (ETW) traveling waves in convecting binary mixtures is presented. Both are related to the convectively unstable nature of LTW, and reflect its different manifestations. In short cells the mechanism which is responsible for the LTW instability is related to the transition from convective to absolute instability. In long cells and negative enough values of the separation ratio Ψ, transition from LTW to ETW occurs due to the interaction of convectively growing perturbations and LTW