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The Generalised Differential Image Motion Monitor (GDIMM) was proposed a fewyears ago as a new generation instrument for turbulence monitoring. It measuresintegrated parameters of the optical turbulence, i.e the seeing, isoplanaticangle, scintillation index, coherence time and wavefront coherence outer scale.GDIMM is based on a fully automatic small telescope (28cm diameter), equippedwith a 3-holes mask at its entrance pupil. The instrument is installed at theCalern observatory (France) and performs continuous night-time monitoring ofturbulence parameters. In this communication we present long-term and seasonnalstatistics obtained at Calern, and combine GDIMM data to provide quantitiessuch as the equivalent turbulence altitude and the effective wind speed.

Turbulence monitoring at Calern observatory with the Generalised Differential Image Motion Monitor