Kavli Affiliate: Bruce A. Macintosh
| First 5 Authors: Alexander Madurowicz, Bruce A. Macintosh, Jean-Baptiste Ruffio, Jeffery Chilcote, Vanessa P. Bailey
| Summary:
A semi analytic framework for simulating the effects of atmospheric seeing in
Adaptive Optics systems on an 8-m telescope is developed with the intention of
understanding the origin of the wind-butterfly, a characteristic two-lobed halo
in the PSF of AO imaging. Simulations show that errors in the compensated phase
on the aperture due to servo-lag have preferential direction orthogonal to the
direction of wind propagation which, when Fourier Transformed into the image
plane, appear with their characteristic lemniscate shape along the wind
direction. We develop a metric to quantify the effect of this aberration with
the fractional standard deviation in an annulus centered around the PSF, and
use telescope pointing to correlate this effect with data from an atmospheric
models, the NOAA GFS. Our results show that the jet stream at altitudes of
100-200 hPa (equivalently 10-15 km above sea level) is highly correlated
(13.2$sigma$) with the strong butterfly, while the ground wind and other
layers are more or less uncorrelated.
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