Abstract
A preliminary report is presented of the investigations made with the satellite Injun I (launched July 29, 1961) on the artificial radiation belt produced by a nuclear device exploded at a high altitude near Johnston Island. The satellite had three particle detectors, two of which were directional and the other was omni-directional. The dynamics of geomagnetically trapped particles are described briefly. Plots of the data are given. It is estimated that there were ~10/sup 24/ freshly injected and trapped electrons of energy >1.5 Mev in the geomagnetic field one hour after the explosion. The rate of loss of electrons of energy >6 Mev is considered briefly. The measured intensities are compared with those of the Argus belts. (D.L.C.)
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