Some measurements of the irregularities giving rise to radio-star scintillations at the equator

Equatorial radio-star scintillations are shown to have maximums near the equinoxes. Measurements on summertime irregularities show them to be elongated along the earth's magnetic field, with an axial ratio of 7.5 or greater. Transverse sizes are of the order of 0.5 km. Velocities of drift are normally from west to east at night, with a mean value of 75 m/sec. The pattern on the ground drifts with remarkably little change. Velocity decreases with time of night, and the pattern size on the ground increases.