The ionosphere is notorious for affecting radio communications.
Characterizing how radio waves behave in this space will be crucial to help future warfighters work effectively, DARPA officials said in an April 22. Signal propagation in the ionosphere is notoriously unpredictable, due to the high density of charged particles that can alter the path of radio signals.
The term"ionosphere" was first used in the 1920s, and by the 1950s the atmospheric zone's effect on radio waves was recognized by organizations such as the Institute of Radio Engineers,. Satellite studies of this region began shortly after the first space launch in 1957 and are still ongoing. "Much of the early research on the ionosphere was carried out by radio engineers and was stimulated by the need to define the factors influencing long-range radio communication," Britannica stated.
The ionosphere's density can be altered by events such as solar activity and the 11-year solar-cycle, making it even more difficult to chart how radio communications are affected in this region.
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