This paper reports the statistical relationship between 1-s averaged rain attenuation (A, in decibels) and standard deviation (&sgr;, in decibels) of simultaneous tropospheric scintillation in 1-s intervals, derived from high-resolution (50 samples/s) experimental 12.5-GHz attenuation time series recorded at Spino d'Adda (45.4 ¿N) in a 30.6¿ slant path to satellite Olympus during an observation time of approximately 1 year. The statistical relationship can be fitted by the power law &sgr;=0.068A5/12 derivable from a thin turbulent layer model. A similar relationship was also previously obtained in the same slant path at 19.77 GHz. As a consequence, we have concluded that at least up to 20 GHz, the modeling is independent of frequency.¿ 1997 American Geophysical Union