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We empirically evaluate the scheme proposed by Lieu & Duan (2013) in whichthe light curve of a time-steady radio source is predicted to exhibit increasedvariability on a characteristic timescale set by the sightline's electroncolumn density. Application to extragalactic sources is of significant appealas it would enable a unique and reliable probe of cosmic baryons. We examinetemporal power spectra for 3C 84 observed at 1.7 GHz with the Karl G. JanskyVery Large Array and the Robert C. Byrd Green Bank Telescope. These dataconstrain the ratio between standard deviation and mean intensity for 3C 84 toless than 0.05% at temporal frequencies ranging between 0.1-200 Hz. This limitis 3 orders of magnitude below the variability predicted by Lieu & Duan (2013)and is in accord with theoretical arguments presented by Hirata & McQuinn(2014) rebutting electron density dependence. We identify other spectralfeatures in the data consistent with the slow solar wind, a coronal massejection, and the ionosphere.

A search for sub-second radio variability predicted to arise toward 3C 84 from intergalactic dispersion