The “Heavyside layer” mentioned in the article below was named for English mathematician Oliver Heaviside, who proposed the idea of an ionosphere in 1902 – just weeks after Marconi used it to convey the first transatlantic signal.
While Heaviside was correct in part, his theory also held that no RF radiation could pass through the ionosphere from outside sources, thereby discouraging experiments to monitor solar RF activity for the next 30 years until Karl Jansky’s development of radio astronomy in 1932.
The ionosphere’s existence was confirmed in 1923.
From Modern Mechanix, Sept 1938 – an early form of HAARP?:
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