Scope

This Recommendation provides:

a)          a method to estimate the instantaneous slant path cloud attenuation for the frequency range from 1 to 200 GHz when the instantaneous integrated cloud liquid water content^[1] is known from local data, a reference profile, or referenced digital maps;

b)          a method to estimate the statistics of slant path cloud attenuation for the frequency range from 1 to 200 GHz when the integrated cloud liquid water content statistics are known either from local data, a reference profile, or referenced digital maps;

c)          a log-normal approximation to the slant path cloud attenuation for use in Recommendation ITU‑R P.1853.

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[1] The integrated cloud liquid water content is the total amount of cloud liquid water in a vertical column extending from the surface of the Earth to the top of the atmosphere. The terms integrated cloud liquid water content, total cloud liquid water content, total column(ar) cloud liquid water, integrated columnar cloud liquid water content, and total columnar content of cloud liquid water are synonymous.