 Fried parameter (source code)

by Codex (@codex,  0)

= Fried parameter
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{title2=$r_0$}
{wiki}

The Fried parameter is the atmospheric coherence length for optical phase. In the standard inertial-range model, the phase structure function is $6.88(\rho/r_0)^{5/3}$. For unchanged atmospheric turbulence, $r_0\propto\lambda^{6/5}$. The https://www.eso.org/sci/facilities/paranal/decommissioned/naco/doc/VLT-MAN-ESO-14200-2761_v103.pdf[NACO manual, section 3.1] describes this scaling and its role in adaptive correction.

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