Abstract
Atmospheric turbulence can be characterized by the scintillation of astronomical sources. The physics of weak and strong scintillation is briefly recalled. The Multi-Aperture Scintillation Sensor, MASS, uses spatial properties of the scintillation produced by single stars to reconstruct low-resolution turbulence profiles. A description of the combined MASS-DIMM instrument is given and the accuracy of this method is evaluated. By replacing a single star with a planet, we can sense turbulence at few hundred meters above the site, and such an experiment is described. However, of greater importance is to measure the turbulence in the immediate vicinity of a telescope or site monitor. Here, lunar scintillation is the method of choice. A simple lunar scintillometer, LuSci, is under development at CTIO. A new method to interpred its data and the results of first tests are presented.
