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Observations of radio stellar scintillation on a frequency of 38 Mc/s were made with three spaced receivers. Suitable records were analysed to determine the average shape of the irregularities in the amplitude pattern on the ground. It was found on all occasions that the irregularities were elongated by a factor of at least 5:1, indicating that the ionospheric irregularities responsible for the amplitude pattern were also very elongated. The directions of stretching were consistent with the hypothesis that the irregularities in the ionosphere were extended along the earth's magnetic lines of force. Further evidence is presented which confirms the hypothesis. It is pointed out that under these conditions it is not possible to determine true velocities of drift from the time shifts between fading curves obtained at spaced receivers, and that the results of previous workers may be seriously in error.
Mark G. Spencer (Mon,) studied this question.