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The cold mirror case

All the considerations above apply to the case where the flow is thermally unstable. For a colder mirror the convection cell cannot become unstable or turbulent unless mechanical energy is supplied in form of a turbulent draft. The seeing will then be a function of the velocity gradient as described by equation (gif) with Ri > 0 and will generally be negligible.

Lorenzo Zago,, Sun Feb 26 22:57:31 GMT+0100 1995