The report summarizes the results of an extensive analysis in the frequency domain of photographic records that recorded, over Canton Island, the late time striations which resulted from the STARFISH nuclear detonation. The basis of this analysis are the frequency domain power spectral densities (PSDs) which were determined from relative optical radiances at various altitudes as a function of time. The analysis indicates how well the time/altitude variance of the power spectra can be represented by a simple analytic expression: (1) a log- log linear (power law) fit; (2) an exponential fit in the frequency domain. It has been found that both of the single simplified expressions underestimate the power at low frequencies. However, for a single simple expression, the log-log linear fit is a better representation of the data at very low frequencies. The report also synthesizes a value for the total number of striations, a radius probability distribution and the spatial area/volume contained within the striations from the exponential fit; (in this synthesis, the striations are assumed to have Gaussian electron density profiles). On this basis, a volume emission from the striated region is determined from which an estimate can be made on the on-axis striation electron density.
