Injun, A Radiation Research Satellite

Abstract

The launching of the Transit 4A satellite on June 29, 1961, marked the first attempt to orbit three satellites simultaneously. The middle member of the three, Injun, is a radiation research satellite developed by Professor James A. Van Allen and his associates at the State University of Iowa. This paper describes Injun in some detail, especially the low-energy proton detectors developed for it at APL, and some preliminary conclusions drawn from the data already received from Injun.