Interplanetary scintillation observations of an unbiased sample of 90Ooty occultation radio sources at 326.5 MHz.

We present 327-MHz interplanetary scintillation (IPS) observations of an unbiased sample of 90 extragalactic radio sources selected from the ninth Ooty lunar occultation list. The sources are brighter than 0.75 Jy at 327 MHz and lie outside the galactic plane (|b| > = 10^deg^). We derive values of μ, the fraction of scintillating flux density, and ψ, the equivalent Gaussian diameter for the scintillating structure. Various correlations are found between the observed parameters. In particular, the scintillating component weakens and broadens with increasing largest angular size (LAS), and stronger scintillators have more compact scintillating components. The correlation between μ and the total source flux density found by previous workers is extended to smaller flux densities, but the three new points do not permit a distinction between a continuing upward trend or a leveling off of μ in the relation between the median values.