Abstract
Scintillation signals from the radio sources Cyg A and Cass A were taken at 26 MHz on nine evenings in 1971 and 1972 at times of ionospheric modification by a high-powered hf transmitter near Boulder, Colorado. The scintillation character often changes significantly during modification. The artificially produced scintillations are either rapid and random or deep long-period modulation. The random scintillations and ionogram signatures (spread F and wide- band attenuation) are directly correlated with transmitter operation and are interpreted in terms of small irregularities (dimensions of 1 to 4 km), whereas the long-period modulation can be interpreted in terms of large irregularities (dimensions of about 10 to 100 km). Small irregularities are similar to natural ones and require a short time to develop, less than a few seconds, but the large irregularities differ from the natural ones and usually take from 5 to 15 min after transmitter on'' to develop. (auth)
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