Proceedings with Extended Abstracts (single PDF file) - Radio ...

Fig. 5. Azimuths of IGW propagation in Shigaraki from SATI observations.4. GPS/Microlab satellite data analysis.Several recent works were devoted to studies of IGW geographical structure in theatmosphere using satellite-borne remote sensing measurements of the backgrounddynamical structure, planetary scale fluctuations, and mesoscale disturbances. Tsuda et al.[2000] made the first analysis of global morphology of IGW activity in the stratospherefrom GPS/MET data. Alexander et al. (2002) continued this study and showed that theLEO/GPS occultation technique provides important and unique data for studies of theglobal distribution of atmospheric IGWs. Tsuda et al. (2000) and Nastrom et al. (2000)showed good agreement between seasonal variations of IGW variances obtained withGPS/MET satellite and with Japanese MU radar and a VHF radar in North America.Low-orbit GPS satellite usually provides vertical profiles of radio wave refractionindex at heights 5 – 60 km with high resolution in altitude. Generally, refractivity N = (n-1)×10 6 decreases exponentially in altitude. More sensitive to small variations is so called“dry temperature”, T dry , given by the expressionT = 77.6 p / N ,(1)drywhere p is atmospheric pressure. The dry temperature is a good estimation of atmospherictemperature at altitudes 15 – 30 km. Dynamical variations δp and δT of parameters in (1)for small-scale turbulence and low-frequency short internal gravity waves (IGWs) satisfyto the condition |δp/p|