A formula to compute the index of stellar scintillation detected with a finite spectral bandpass and with arbitrary aperture is derived in the limit of weak perturbations. It also applies to differential scintillation (relative fluctuations of light intensity in a pair of apertures), where the effect of finite bandpass turns out to be significant. The new formula is used for measurements of free-atmosphere seeing and low-resolution turbulence profiles with concentric-ring apertures.
© 2003 Optical Society of America
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(030.6600) Coherence and statistical optics : Statistical optics
(280.7060) Remote sensing and sensors : Turbulence
(290.5930) Scattering : Scintillation
Andrei A. Tokovinin, "Polychromatic scintillation," J. Opt. Soc. Am. A 20, 686-689 (2003)