Explorer 1 carried only one instrument...[which] worked quite well at low altitudes, but at the top of the orbit no particles at all were counted. Explorer 3, which followed two months later, collected on tape a continuous record of data, which revealed that the zero counts actually represented a very high level of radiation. So many energetic particles hit the counter at the higher altitudes, that its mode of operation was overwhelmed and it fell silent. Not only was a radiation belt present at all times, it was remarkably intense.
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