|Proceedings of the Conference on Nonlinear Coherent Structures in Physics and Biology,|
Heriot-Watt University, Edinburgh, July 95
Department of Mathematics,
University of Strathclyde,
Livingstone Tower, Richmond Street,
Glasgow G1 1XH, Scotland.
For strong non-isothermality and to lowest order, small amplitude waves have a sech^4 form. Higher order corrections to this are obtained via the Sagdeev potential rather than using the more usual method of reductive perturbation with renormalization. Existing results in the literature derived using the latter approach are corrected and extended.