I found this article, Sputnik Was More Advanced Than U.S. Admitted, Historian Uncovers by Alex Canizares, on www.space.com
According to the article, Sputnik I and Sputnik II satilites examined the Earth's outer radiation belt, because the Soviet satilites could go into a higher orbit than the USA Explorer series.
The Explorer series examined the Earth's inner radiation belt.
The Soviet's could not observe this belt because they could not pick up the satilites signs from the Southern Hemisphere.
These radiation belts are named after James Van Allen.
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