The SOFIA experiment which took place in the Azores region during ASTEX, in June 1992 was devoted to surface flux and marine atmospheric boundary layer investigations at the mesoscale. The different instrumented platforms used are described: shipborne instruments, drifting buoys, airborne instruments, satellites. After a description of the main characteristics of the whole experiment which corresponded to perturbed cloudy meteorological situations with a latent heat flux close to 100 W/m 2 , a sensible heat flux smaller than 30 W/m 2 and moderate wind speeds <10m/s, an analysis of two observing periods of June 8 and 17 is undertaken. For these two days we illustrate the use of several kinds of equipment such as the airborne Lidar LEANDRE, the radiometer POLDER, the acoustic system OCARINA and the microwave radiometer DRAKKAR. In particular, the wake effect due to Santa-Maria island is documented with the constant level balloons and the instrumented aircraft ARAT.
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