Amplitude Scintillation Spectra in a Low Elevation Downlink from Sirio Satellite

Amplitude scintillations in a low elevation link from SIRIO satellite are discussed. Examples of power spectra obtained during calm summer nights, clear sky noons and in presence of clouds are shown. Selected noon spectra have been compared to radiosoundigs and known model of turbulence has been found appropriate to describe the spectra, if some simple assumptions are made. A method for estimating theoretical scintillation power is outlined which may lead to more accurate estimates of turbulence parameters.