Abstract
A statistical comparison of the depth of scintillation of the 54 MHz beacon of satellite, Transit 4A, to the depth consistent with 63 and 113 MHz observations of radio star, Cassiopeia A, indicates that (a) a thin screen of irregularities of height about 450 km and size somewhat greater than 1 km may represent weak scintillation during quiet geomagnetic periods but that (b) for scintillation indices above about 20 per cent or during periods with local magnetic K-index above 2, the analysis should be based on a thick layer of irregularities.
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