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diffractive interstellar scintillation

(diffraction of star light by the ISM)

Diffractive interstellar scintillation (DISS) is scintillation (twinkling) of stars due to diffraction in the interstellar medium (ISM) rather than the familiar twinkling produced by the Earth's atmosphere. It is commonly produced by discontinuities in the ISM's ionization. When identified, DISS can sometimes be used to make very accurate measurements and images of the scintillated objects, by modeling the object and effects that could cause the observed scintillating image.