A large negative-polarity coronal-hole high-speed stream (CH HSS) has been rotating into Earth’s line of sight since 23 June, prompting NOAA SWPC to issue a G2 geomagnetic-storm outlook for 25–26 June UTC. Solar wind gusts exceeding 600 km/s are expected, with the planetary K-index (Kp) peaking near 5–6. Solar Cycle 25 is nearing its predicted…
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The 24–25 June 2025 event is forecast to reach G1–G2 geomagnetic storming with a peak Kp of 5.67. NOAA SWPC’s 3‑Day Forecast issued on 24 June projects storming for 25–26 June. Up to 14–15 states could see auroras, from Alaska and Washington to New York and South Dakota. A large equatorial coronal hole rotated into…
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