Overview
- Peer-reviewed analysis published March 5 in The Astrophysical Journal uses spacecraft radio data to quantify how turbulent plasma near stars broadens narrowband signals.
- The team reports that a 100 megahertz transmission can be widened by roughly 10–100 hertz, with broadening spiking during solar storms and diminishing with distance from the star.
- Because many SETI pipelines target razor-thin, sub-hertz channels, such smearing can push otherwise detectable technosignatures below current sensitivity thresholds.
- Active M-dwarf systems, which make up about 70–75% of Milky Way stars, are flagged as especially likely to hide narrowband signals, informing target selection and interpretation of null results.
- Experts say adapting searches to these effects could modestly raise detection odds, even as expectations for near-term discoveries remain low.