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!he use of a 1.9-cm radi o sextant ca])a blc. of p recise trac kin g of t he S U ll has produ ced a cc.lll ate meas LH ement~ of total atmosphen c mICrowa ve rC'fractlon. These data are used to v enfy t he h igh correlat ion of suc h refraction wi.t h surface re fractivity for low alt it ude angles. The values of t he cOl'l'clatlO n coe ffi Cients obtain ed vary from 92.2 percent at 16 dc" rccs to 98 .percent at 2 degrees . An empi rical p redicto r .is developed , based on th is cO I)'ela t ion which sat!sfacto l'lly accounts for the obse rved refract io n. The mat hema t ica l form of t h~ predICtor l S given, an d s ugges tions are made for its usc .

Use of surface refractivity in the empirical prediction of total atmospheric refraction