official data
SWPC: secondary CME package may combine early 08 Sep — Kp max 3.67 / no G1
SWPC Forecast Discussion issued 2026 Sep 06 0030 UTC reports several CMEs. The CME associated with the M1.0 from plage Region 4520 is modeled to pass ahead of Earth orbit. Additional eruptions carry modeling that suggests a possible combined arrival early 08 Sep. Greatest expected Kp 3.67 — below NOAA G-scale; no G1 or greater geomagnetic storms expected. S1 proton context already boarded separately. Live Kp / solar wind = see live HUD.
Key facts
- Window
- Possible combined CME arrival early 08 Sep (modeled)
- Geomagnetic
- No G1 expected; greatest Kp 3.67
- M1 CME
- Region 4520 M1.0-associated CME modeled ahead of Earth orbit
- Related
- See S1 note for proton / R1 detail
- Live
- Kp / solar wind → live HUD
Note
Primary: NOAA/SWPC Forecast Discussion and 3-Day Forecast issued 2026 Sep 06 0030 UTC.
What it is not: a G-storm; micronova; Earth-directed M1 arrival (ahead of Earth per Discussion); a frozen live gauge.
Why it matters
Secondary solar card under boarded S1. Weight is the early-08-Sep window while G-scale stays quiet.
Sources
Official data. Live values go to the HUD / source product.