T echniqu es for d etermining t he cha racteri stics of. m ovem en ts of irreg ula ri t ies i n. t he F2-reg ion by t he use of ba ck scatte r r ecords are d es cribed.. The res ul ts of a n a nalySIS of bac kscat ter d at a obtained during D ecember 1952, at SterlIn g, VU'gll1l a, at 11 fr equ ency of a bout 13. 7 M c/s ar e presen ted a nd found to be in good agr eem ent wi t h t hose o f other invest igators of ionospheri c motions.

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Measurements of the spectrum of high-frequency radio waves scattered from the sea surface and propagated by the ionosphere show that the expected split-spectrum characteristic of scatter from the sea is preserved and suggests the possible use of high-frequency backscatter with a high-resolution receiving system to monitor varying sea state over wide areas.

Peculiar signal enhancements observed during transmissions at 36 to 50 Mc/s between the Philippines and Okinawa appear to represent F‐layer scatter. These signals are observed nightly for periods of several hours during the months of September and October. Pulse tests indicate F‐layer heights for these signals. Considerable pulse broadening is observed and the signals generally arrive from somewhat off the great circle path.

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