Izaña, Tenerife
Izaña is the longest-running site of BiSON and has been producing data since 1975. Our station is situated at the Observatorio del Teide (in the pyramid-like building). It is operated under a collaboration with the I.A.C., and requires daily attention.
Unlike the more recent stations, this spectrometer is not equatorially mounted. Sunlight is fed into the instrument using a coelostat (shown in the above image) - an arrangement of mirrors which change their orientations during the day to follow the course of the Sun. The output beam is then reflected through a hole in the wall of the pyramid into the instrument.
Weather Conditions
Real-time cloud cover over Izaña.
Go to the BiSON Weather Watcher to see the current cloud conditions over all our stations.

























![[Izana site picture]](Images/Bison/izana_coelostat.gif)