Phys. Rev. Lett. 88, 134501 (2002) [4 pages]Convective and Absolute Eckhaus Instability Leading to Modulated Waves in a Finite BoxReceived 6 September 2001; published 13 March 2002 We report an experimental study of the secondary modulational instability of a one-dimensional nonlinear traveling wave in a long bounded channel. Two qualitatively different instability regimes involving fronts of spatiotemporal defects are linked to the convective and absolute nature of the instability. Both transitions appear to be subcritical. The spatiotemporal defects control the global mode structure. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.134501
DOI:
10.1103/PhysRevLett.88.134501
PACS:
47.20.Lz, 05.45.-a, 47.35.+i, 47.54.+r
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