Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371..366p&link_type=abstract
Astronomy and Astrophysics, v.371, p.366-377 (2001)
Astronomy and Astrophysics
Astrophysics
19
Atmospheric Effects, Site Testing, Turbulence, Methods: Data Analysis, Techniques: Image Processing
Scientific paper
We present SCIDAR measurements made at the Pic du Midi Observatory with PISCO. A series of vertical profiles of the refractive-index structure constant CN2(h) was obtained with the observations of the binary stars gamma Del and gamma Ari, with 30 second time sampling. In the free atmosphere, the turbulence was dominated by the contribution of a few well-separated atmospheric layers at altitudes in the range 8-20 km, with significant changes within a few minutes. We describe a new method based on the CLEAN algorithm applied on the 2-D covariance function of the irradiance fluctuations in the pupil plane and compare it with the widely-used Maximum Entropy Method applied on a slice of this 2-D function. Our method is much less sensitive to the noise. Vertical profiles of the wind velocity and direction were obtained with an automatic procedure working on the mean cross-correlation function of consecutive frames. Furthermore, we validate a model for the SCIDAR detectivity threshold in terms of distance to the turbulent layers. Based on observations made with the Télescope Bernard Lyot at Pic du Midi Observatory, France.
Avila Ricardo
Daigne Gerard
Prieur Jean-Louis
No associations
LandOfFree
SCIDAR measurements at Pic du Midi does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with SCIDAR measurements at Pic du Midi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SCIDAR measurements at Pic du Midi will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1266551