Stellar Space Weather Broadens Signals from Extraterrestrial Transmitters, Challenging Narrowband SETI Searches

To the point

Researchers at the SETI Institute say space weather around stars widens and weakens radio signals from extraterrestrial transmitters as they travel, making traditional narrowband searches harder; led by Dr. Vishal Gajjar and Grayce C. Brown, they built a practical way to estimate this broadening for different star types and frequencies and note that M-dwarfs are especially prone, so searches should be designed to detect signals that are not ultra-narrow.