1. From the decay rate of the electron count, the density of the atmosphere at great heights above the earth can be inferred, The results so far seem to confirm the predictions that the "exosphere" is somewhat denser than had formerly been supposed, confirming recent clues from satellite drag data. 2. The experiment provides the first extensive experimental evidence concerning the structure of the earth's magnetic field above a thousand miles or so. The fact that the electrons emitted by the. shot remained mainly confined to a layer about one hundred miles thick for two weeks shows that even 4000 miles above the earth the magnetic field is not unduly turbulent as some scientists had suspected. I ok 1%Samy “REPRODUCED AT THE. ~ ‘ D.. 3. Comparison of the man-made aurorae of the ARGUS experiment with natural ones may throw considerable light on the mechanism of those perplexing phenomena.

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