The new site testing survey in the Canary Islands' Observatories

The future establishment of large telescopes at the Observatorio del Roque de los Muchachos (ORM) has raised the necessity of designing a site-testing campaign, aimed specifically at selecting their emplacements, as well as characterizing correctly the local seeing behaviour and the fluctuations of the turbulent field in the area covered by the observatory.This paper describes the site evaluation programme to be carried out at the ORM during the next four years. The data obtained in this program will improve earlier tests in the critical areas of sub-are sec seeing, the size of the isoplanatic patch, the efecto Caldera and suitability for infrared astronomy, among others.Paper presented at the 11th European Regional Astronomical Meetings of the IAU on New Windows to the Universe, held 3–8 July, 1989, Tenerife, Canary Islands, Spain.