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Journal of Geophysical Research



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A high-performancero cketc arryinga four-frequencyp, hase-coherenbt eacona nd full complemento f in situ diagnostici nstrumentationw as launchedi nto active equatorial spreadF on July 17, 1979. In this paper we report the resultso f spectrallya nalyzingt he beaconp hase-scintillationa nd Langmuir probe data. By using simultaneousb ackscatterd ata from the Altair radar we were able to establisht hat the scintillation develops in high-density regions adjacent to the prominent plume structures and associated depletionsIn. theseh igh-densitrye gionsth e in situs pectras howa pronouncecdh angein the powerl aw slopen ear a spatialw avelengtho f 500 m. Larger scales tructuresa dmit a systematicallyv arying power law index that is generally less than 2, in good agreement with a large body of Wideband satellite data and recently analyzed Atmospheric Explorer E data. Smaller-scale structures admit a spectral index muchl argert han2 . A singleo, verallp owerl aw neark - 2 wasf oundo nlyi n low-densitrye gionsth at did not contributes ignificantlyt o the scintillation.T he resultsp resentedh ere and in a companionp aper suggestt hat refinementsin the current theorieso f equatorials preadF near and above the F region peak are needed.