Region 4232 produced two CME-associated M-class flares on September 28 and 29, 2025 — an M6.4 at 08:43 UTC on September 28 and an M3.6 at 01:45 UTC today. Forecast calls for unsettled to isolated G1 – Minor geomagnetic storm conditions on September 29, with mostly quiet levels returning by October 1.
A geomagnetic storm that began late on September 14, 2025, intensified to G3 – Strong levels early on September 15, producing auroras visible as far south as Texas. The storm was driven by a negative polarity coronal hole high-speed stream (CH HSS) with possible influence from a coronal mass ejection (CME) launched on September 11.
A G1 – Minor Geomagnetic Storm Watch was issued by NOAA’s Space Weather Prediction Center for September 14, 2025, anticipating weak power grid fluctuations, minor satellite impacts, and possible auroras at high latitudes. No storm activity is forecast for September 15 and 16.
A large filament eruption was observed at 19:45 UTC on September 4, 2025, followed by at least three CMEs. Model runs suggest a likely arrival early on September 7. In addition, a recurrent positive polarity coronal hole high-speed stream (CH HSS) activity is expected to enhance solar wind parameters beginning early September 6, with G1 – Minor to G2 – Moderate geomagnetic storm conditions likely through September 8.
A coronal mass ejection (CME) produced by the August 30, 2025, long-duration M2.7 solar flare impacted Earth at 21:01 UTC on September 1, producing G1 – Minor to G2 – Moderate geomagnetic storm conditions.
A long-duration solar flare measuring M2.7 at its peak erupted at 20:02 UTC on August 30, 2025. The eruption produced an asymmetric full halo coronal mass ejection (CME), with impact expected late September 1 into September 2. A G3 – Strong geomagnetic storm watch is in effect.
A large coronal mass ejection (CME) was produced by a prominence eruption off the Sun’s southeast limb at 04:30 UTC on August 20, 2025. The CME is not Earth-directed, and solar activity is forecast to remain at very low to low levels, with a slight chance for M-class flares in the coming days.
A G2 – Moderate geomagnetic storm watch is in effect for August 8, 2025, due to an incoming coronal mass ejection (CME) and co-rotating interaction region from a coronal hole in the Sun’s southern hemisphere.
A moderately strong M4.4 solar flare erupted from Active Region 4168 at 15:53 UTC on August 5, 2025, producing a coronal mass ejection (CME). Initial modeling indicates most of the material was directed ahead of Earth’s orbit, with a glancing blow or shock arrival possible by late August 8.
A faint partial halo coronal mass ejection (CME), associated with a filament eruption near N07W12 at approximately 05:00 UTC on July 23, 2025 is forecast to arrive at Earth around midday UTC on July 27.
