A knowl edge of the sta tistics of a tmosphere-induced v aria t ions in t he p ha se of Lhe received signal (i. e., va riations in electrical path length) is esse ntia l in eva luaLing ('he r elia bility of a ny sy ste m using radio wa ves for measur ing dista nce a nd/or ve loei Ly. This p ap er d escribes a n ana lysis of phase varia t ion s measured at 9,400 m egacycles p el' seco nd over a 9.4mile path near Boulder, Colora do, during a 40-hoLll' period in SepLe rnber 1958. The power sp ectral density of these variations is shown to be a pproximately prop ort ion a l t o j-2 .8 over a wide range of fr eque nci es t lu'o ughou t the p eriod of recordin g. The long-term phase v a riation s are closely correlated ,,'ith atmospheric refrac tivi ty measure ments ma de at the path term inals.

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The National Bureau of Standards has been conducting a series of measurements for a study of the characteristics of the turbulent lower atmosphere and its effect on the accuracy of radio direction‐finding, guidance, and geodetic measurement systems. The results of three experiments are presented, one consisting of recordings of refractive index and apparent path length variations at 9400 Mc/s over a 15.5‐mile path on Maui, Hawaii and the other two consisting of similar measurements made over a 9.5‐mile path near Boulder, Colorado. The correlation of refractive index and apparent path length fluctuations is discussed as well as the power (variance) density spectra of both variables.