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Figure 1 from Appleton’s Nobel Prize lecture in 1947, demonstrating how a radio wave can travel long distances by reflecting off an ionized layer of the atmosphere. (©The Nobel Foundation)

 

Figure 1 from Appleton’s Nobel Prize lecture in 1947, demonstrating how a radio wave can travel long distances by reflecting off an ionized layer of the atmosphere. (©The Nobel Foundation)

Figure 1 from Appleton’s Nobel Prize lecture in 1947, demonstrating how a radio wave can travel long distances by reflecting off an ionized layer of the atmosphere. (©The Nobel Foundation)


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