Abstract
The properties of the broadband fluctuations of the interplanetary plasma are discussed, taking into account observations in the vicinity of 1 AU heliocentric radius on space probes. Aspects of interplanetary scintillations and angular broadening as a probe of the solar wind are considered, giving attention to the 'thin-screen' approximation, a three-dimensional model of interplanetary scintillations, the structure of density fluctuations, and the determination of solar wind velocity from scintillations. It is pointed out that the theoretical understanding of the origin and evolution of the fluctuations and their full import for the solar wind is still at a relatively rudimentary stage.
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