Experimental confirmation of long-memory correlations in star-wander data

LUCIANO ZUNINO; DAMIÁN GULICH; GUSTAVO FUNES; AZIZ ZIAD

OPTICS LETTERS

OPTICAL SOC AMER

Lugar: Washington; Año: 2014 vol. 39 p. 3718 - 3721

0146-9592

In this Letter we have analyzed the temporal correlations of the angle-of-arrival fluctuations of stellar images. Experimentally measured data were carefully examined by implementing multifractal detrended fluctuation analysis. This algorithm is able to discriminate the presence of fractal and multifractal structures in recorded time sequences. We have confirmed that turbulence-degraded stellar wavefronts are compatible with a long-memory correlated monofractal process. This experimental result is quite significant for the accurate comprehension and modeling of the atmospheric turbulence effects on the stellar images. It can also be of great utility within the adaptive optics field.