Abstract
We report ionospheric scintillation observations made at Natal, Brazil, during a period of 2½ years. The nighttime scintillations of satellite signals at 250 MHz commonly exceeded 20 dB peak‐to‐peak. Seasonally, it showed a typical behavior for the South American sector with a single peak centered around October–November months and the local evening hours of 2100–2300 LMT. This seasonal behavior was different from that of the African sector and very different from that of the Pacific sector. On a spacing of 278 m the eastward irregularity drift speed was measured by the method of similar fades. This, together with the determination of Fresnel frequency from the power spectrum analysis, was used to calculate the height of the irregularity patch. A value of 294 km was obtained. Multisatellite scintillation observations indicated that even though the initiation of an irregularity cloud commonly occurred earlier on signals transmitted by the eastern satellite, there were substantial cases when the reverse was observed. One case which was analyzed in detail suggested that the irregularity clouds formed independently along two radio paths separated by 520 km.
Published Version
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