= Internal-wave attractor
A periodic spatial <internal-wave ray> toward which neighbouring ray paths converge after reflection in a confined stratified basin. A fixed point of an <internal-wave ray return map> is attracting when its derivative has magnitude below one. <Viscous attenuation of an internal-wave beam> and <internal-wave breaking> regularize the ideal <concentration> of energy. A spatial ray construction does not remove turning-level limitations of the <WKB approximation>.
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