Abstract
Recently Einaudi and Hines discussed the fact that different wave parameters of acoustic–gravity waves may have different reflection heights. This raises the problem that there will be a range of heights over which one parameter is evanescent, whereas another parameter is in its normal propagation region. It is not obvious that for this second parameter the range of heights does not encompass many wavelengths and thus there would be a large relative phase change between the two parameters.However, it is shown that the extent of the relative phase change will often be less than 2π, and the conditions under which it may exceed 2π are derived.
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