Stellar Activity Could Blur Narrowband Radio Signals, Complicating Technosignature Searches

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SETI Institute researchers warn that stormy space weather around stars can blur alien radio signals by broadening ultra-narrow emissions as they travel through stellar winds and plasma, dispersing energy across frequencies and weakening peaks, which could cause traditional narrowband searches to miss detectable signals, Grayce C Brown says higher frequencies may help, and Vishal Gajjar adds that strategies that account for broadening could still detect such signals in a study published in the Astrophysical Journal.