Abstract
Extensive air‐shower trajectories and sizes (numbers of charged particles) have been measured using an optical detection system at Volcano Ranch Station near Albuquerque, New Mexico. Light produced by atmospheric scintillation and Cherenkov emission by shower particles was measured at distances of 0.7 to ∠10 km. The shower sizes determined by the optical measurements are in satisfactory agreement (an average of 10% higher) with measurements by the ground‐level scintillation‐counter array at Volcano Ranch. Twenty‐four optical units have now been constructed on top of Little Granite Mountain, Dugway, Utah, and are nearly operational. Important parameters of the optical system and electronic data acquisition system are presented along with data rate estimates based upon the calibration experiment performed at Volcano Ranch.
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