The refractive index variations arise directly from temperature fluctuations
and can be measured by using the temperature fluctuations (Woolf 1982) with
Cn2(z)= ( 7.9 10-5
EP / T2)2CT2(z),
where Cn2 is the refractive index structure coefficient,
and CT2 the temperature structure coefficient.
Pressure P is in hPa, temperature T in K degree,
and z is height above ground in meter.
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Principle of CT2 measurement
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CT2 sensor photos