Research Division Seminar
Using Sodium Layer anisotropies for measuring the atmospheric turbulence, including tip-tilt!
It is well known that Adaptive Optics observations do require the availability of natural stars, on top of laser guide stars, to obtain the tip-tilt and focus information of the atmospheric turbulence. These bright enough natural stars are not always available and this is one the ultimate limits of the AO techniques, due to the small technical field planned for 40m range telescopes. Also the use of half a dozen LGSs, with their respective wavefront sensors and tomography computations, required to properly reconstruct the turbulence column, add significant complexity and cost to the Adaptive Optics systems.
Anisotropies in the Sodium Layer density, if confirmed, could be used for a compelte measurement of the atmospheric turbulence. The talk will include a description of the idea, a discussion about about its viability, and finally an open call to people interested in participating in the campaigns.
About the talk