Note:  Corresponding author: V. Fabbro, ONERA, 2 avenue Edouard Belin 31055 Toulouse, France. E-mails: email@example.com; firstname.lastname@example.org (N. Jeannin); email@example.com (J. Lemorton); firstname.lastname@example.org (D. Van hoenacker-Janvier); email@example.com (K. Djafri).
Abstract: Microwaves propagation modelling in clear air troposphere (i.e. without rain) is investigated. Large scale variations of refractivity are computed from mesoscale meteorological modelling. Small scale variations are deduced from large scale considering that the inertial regime of Kolmogorov spectrum is established. The propagation effects are estimated applying launching ray to take into account large scale refractivity effects and resolution of Parabolic Wave Equation with Multiple Phase Screen technique for small scale. The proposed approach has been evaluated versus earth satellite measurements of log-amplitude scintillation measured at Louvain-la-Neuve.