32 Dish Microwave Spectroheliograph and Compound Interferometer Unit

The first instrument developed at Heliopolis was a crossed grating array for solar observations, known also as the solar cross. The solar cross consisted of 32 parabolic antennas 10 feet in diameter arranged in two linear arrays and operated at 9.1 cm wavelength. The Stanford cross was used to make daily maps of the sun from June 1962 to August 1973. Materials in this unit are dated 1955-1973 and include notes, drawings, correspondence with antenna manufacturers, and blueprints. Also included are a log book for April 1969-September 1973, and laboratory notebooks kept by Roger S. Colvin and Alec G. Little on their work.

Papers of Ronald N. Bracewell

Memos on the design, construction, and operation of the instrument may be found in the Glints, see the Stanford University Publications Series below. See the Air Force Office of Scientific Research Subunit below for materials on the funding for construction and subsequent research. See the Heliopolis Demolition Unit below for materials on the demolition of the antennas.

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1969

1973

Stanford University Series