Interstellar Scattering in Radio Astronomy

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9414144 Rickett Drs. Rickett and Coles will study the scattering of radiowavelength radiation as it passes through the interstellar plasma. The motivation for the research is twofold: first to understand the scattering and so predict the distorting effects of interstellar wave propagation for radio astronomers; second to record the distortions and scattering and to interpret them as a way of studying the distant ionized interstellar medium. In the first case the scattering causes a galactic seeing problem for radio astronomers; in the second case the details of the scattering provide a signal which can be used to remotely probe the characteristics of the very diffuse interstellar plasma.