Mariner 10 radiation. The plasma experiment's goal was to study the ionized gases (plasma) of the solar wind, the temperature and density of its electrons, and how the planets affected the velocity of the plasma stream. The experiment contained two components, facing in opposite directions. The Scanning Electrostatic Analyzer was aimed toward the Sun, and could detect positive ions and electrons, which were separated by a set of three concentric hemispherical plates. The Scanning Electron Spectrometer was aimed away from the Sun, and detected only electrons, using just one hemispherical plate. The instruments could be rotated about 60 degrees to either side.
Sun Stream Stakes and became a successful broodmare, producing the 1000 Guineas winner Tideway and Heliopolis, a full brother to Sun Stream who was twice Leading sire in North America. Lord Derby sent the filly to his private trainer Walter Earl at his Stanley House stable in Newmarket, Suffolk. Sun Stream's racing career took place during World War II during which horse racing in Britain was subject to many restrictions. Several major racecourses, including Epsom, Ascot and Doncaster, were closed for the duration of the conflict, either for safety reasons, or because they were being used by the military. Many important races