Issue |
A&A
Volume 396, Number 1, December II 2002
|
|
---|---|---|
Page(s) | 353 - 360 | |
Section | Numerical methods and codes | |
DOI | https://doi.org/10.1051/0004-6361:20021422 | |
Published online | 22 November 2002 |
Non-Kolmogorov features of differential image motion restored from the Multichannel Astrometric Photometer data
Main Astronomical Observatory, National Academy of Sciencies of Ukraine, Zabolotnogo 27, 03680 Kyiv-127, Ukraine
Corresponding author: laz@mao.kiev.ua
Received:
14
March
2002
Accepted:
10
September
2002
In this paper we present a new restoration of atmospheric turbulent
parameters
using published data on image motion observations with the
Multichannel Astrometric Photometer. These data have been
previously analyzed by Han (1989) whose
estimate of the power of the phase structure function
was close to the 5/3 value expected for the Kolmogorov
atmospheric turbulence.
Investigating the temporal image motion spectrum, we show, however,
that the
experimental data do not follow predictions of the Kolmogorov
model. The best fitting of the observed spectrum is achieved with
, which is
typical of non-classic phase distortions.
The outer scale of turbulence
was found to be 1800 m or longer. Expressions for
the non-Kolmogorov temporal spectrum of differential image motion
allowing for a finite outer scale length are given.
Key words: atmospheric effects / turbulence / methods: data analysis / astrometry
© ESO, 2002
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