The transient aurorae/airglow hypothesis attributes ashen light to unusually high solar activity interacting with the upper Venusian atmosphere.
Sources
- Ashen light (en.wikipedia.org)
- https://www.sciencefocus.com/space/venus-ashen-light (sciencefocus.com)
- https://explainingscience.org/2025/11/15/the-mystery-of-the-ashen-light-of-venus/ (explainingscience.org)
- https://www.universetoday.com/articles/aurora-on-venus-versus-solar-activity (universetoday.com)
- https://pubs.giss.nasa.gov/abs/le06300n.html (pubs.giss.nasa.gov)
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