Abstract
Fluctuations in the intensity of cosmic radiosources, which are slower than interplanetary scintillations and are observed during radio astronomical studies of the solar wind, are discussed. It has been indicated that daytime variations (on average, from 8 to 16 h) are caused by large-scale disturbances in the solar wind rather than are of an ionospheric origin. A conclusion is made that such variations can be used to study the near-solar interplanetary space and predict space weather.

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