  An observer, situated several thousand light-years away from a radio pulsar,
finds himself embedded in the diffraction pattern resulting from the
propagation of the radio waves through the irregular interstellar medium. The
observer's movement relative to the pattern causes an apparent scintillation of
the pulsar. A binary star, situated close to the pulsar's line-of-sight, is
generating relatively strong gravity waves. The rays originating from the
pulsar experience a tiny periodic deflection due to the gravity waves produced
by the binary star. This deflection displaces the diffraction pattern laterally
in a manner that is familiar from refractive interstellar scintillation, except
that this gravity wave effect is not dispersive. The displacement has the same
period as the gravity waves. Its amplitude equals the product of the tiny
deflection angle and the large distance from the binary star to the observer.
This periodic displacement can reach a few hundred kilometers, which can be
comparable to the size of the features in the diffractive pattern. Thus, there
seems to be a possibility that the exceedingly faint gravity waves can manifest
themselves macroscopically. Observationally, the end effect could be a
substantial, deterministic alteration of the scintillation time structure.
