Giving the high angular resolution and the high sensivity of the required THEMIS observations, it is fundamental to minimize the turbulence caused by the Sun heating the ground surface during daytime as well as the turbulence within the building due to thermal unbalance. The THEMIS building specific design enables to preserve image quality:

• As with all modern professional solar observational facilities, the collection of the solar light by the telescope is done at several tens of meters of altitude, in order to be above the most turbulent layers that are close to the ground. In the case of THEMIS, the telescope is located at 22.5 meters high, under the dome at the THEMIS building.
• White gravel around building increases light reflection in building surrounding
• Rounded shapes of the building and building orientation, aligned with prevailing winds, favors stable wind circulation and better morning observations
• Thermally controlled building
• White-painted aluminum cladding and telescope fitting dome aperture, to reduce heat absorption and transfer
• Inner concrete tower, independent of the main building, to prevent the transmission of vibrations to instruments