Event Brief
Solar CME set to reach Earth Thursday, may trigger storm
By The BriefBrief · Sources (1)
Filed: Sep 17, 2026 at 6:08 AM ET
Summary: A coronal mass ejection (CME) that began with an eruption from active region AR4528 on Monday is expected to reach Earth on Thursday. Forecasters say it could cause a minor geomagnetic storm and likely auroras at high latitudes, with effects building gradually as fast solar wind from a coronal hole adds to the CME’s push.
WHO: EarthSky (co-written by a NASA solar scientist); NOAA solar-wind modelling
WHAT: A CME from the Sun is forecast to arrive at Earth, with potential minor geomagnetic storm and auroras.
WHEN: Sep 16, 2026 at 8:00 PM ET
WHERE: Earth (high latitudes)
WHY: The Sun’s CME is expected to disturb Earth’s magnetic field when it arrives, producing a geomagnetic storm and auroras.
How this brief is built: The BriefBrief uses multi-source information fusion to correlate reporting across sources, identify related developments, and continuously update a structured WHO, WHAT, WHEN, WHERE and WHY event picture. Pattern arcs, source analysis, and velocity indicators provide deeper analysis in our MI Console.
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