Spatio-temporal analysis of the wave front with the GSM
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The Generalized Seeing Monitor (GSM) is speciically a monitor of the outer scale. It measures also the seeing angle and the scintillation index. The GSM is operational since one year and its data base contains already the results of three campaign in diierent astronomical sites. Before the end of the year 1998, two other missions will still extend this data base. These integrated parameters useful for the design of the Adaptive Optics Systems have to be completed by local parameters as the C 2 n prooles or the wind prooles. With an analysis of the angles of arrival of the wavefront, the GSM is now able to detect the more turbulent layers of the atmosphere and to measure the wind which carries the turbulent eddies inside.
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