Radio star fadeouts on phase‐switching interferometer records

On occasion, the amplitude of the pattern produced by a radio star on the record of a phase-switching interferometer is observed to decrease. The interpretation of these fade-outs is discussed, and they are shown to be caused mainly by phase scintillations. Simultaneous observations of fadeouts on two 53-Mc/s phase-switching interferometers having antenna separations of 25 and 50 wavelengths show that many of the fadeouts are caused by phase fluctuations having scales of a few hundred meters, and rms amplitudes of one or two radians. These irregularities appear to accompany rather than supplant the large-scale irregularities normally associated with radio star scintillations.