Interplanetary scintillation of radio sources during August 1972

The observations of interplanetary scintillation of radio sources in early August 1972 are reviewed. Three-site measurements of solar wind speed were made at University of California, San Diego (73.8 MHz) and at Nagoya University, Toyokawa (69.3 MHz). Single-site measurements of scintillation index were made at Mullard Radio Astronomy Observatory, Cambridge (81.5 MHz) and at University of Adelaide (111.5 MHz). The enhancements in solar wind speed and scintillation index associated with three shock waves were detected. The extent in both longitude and latitude of the shock wave associated with the solar flare on 7 August, the anisotropic expansion of shock waves and the detection of the corotating high-speed streams are main results deduced from the observations.