As a consequence of an astrometry program, conducted since 1975 on a solar astrolabe at
the Calern Observatory (Observatoire de la Côte d'Azur), we have obtained a data set of …

The vertical distributions of optical turbulence (C n 2 profiles) are a major factor in defining
the capabilities of ground-based telescopes and interferometers. As site-testing campaigns …

We present summer site testing results based on DIMM data obtained at Dome C, Antarctica.
These data were collected on the bright star Canopus during two 3-months summer …

Due to the space and time constraints of turbulence measurement equipment and the
experiment scene, it is difficult to obtain the atmosphere refractive index structure constant …

The solar diameter, and its possible variation, have been the subject of careful
measurements for over 350 years, with ever increasing accuracy. The importance of the …

The first astronomical seeing monitoring has been made with a DIMM instrument at the
Antarctic plateau site of Dome C in December, 2002 on the bright star Canopus (α Eri) …

We use Singular Spectrum Analysis (SSA) to analyze total solar irradiance variations and
CERGA radius measurements. Total solar irradiance has been monitored from space for …

The results from 9112 independent measurements of the solar diameter, made between the
years 1998 and 2000, at the Observatório Nacional Rio de Janeiro station, are examined …

Diameter measurements performed with the solar astrolabe are affected by instrumental and
atmospheric effects. The problem is to know how these effects contribute to the error on …

Ground-based solar observations are strongly affected by optical turbulence. The concept of
a new instrument which allows one to measure both spatial and temporal parameters of …