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 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.
An impulsive solar flare measuring X1.9 erupted from Active Region 4114 at 23:50 UTC on June 19, 2025. The event started at 23:37 and ended at 23:54 UTC.
An impulsive solar flare measuring X1.2 erupted from Active Region 4114 at 21:49 UTC on June 17, 2025. The event started at 21:38 and ended at 21:54 UTC.
A strong M8.4 solar flare erupted from Active Region 4114 at 18:07 UTC on June 15, 2025. This event began at 17:45 UTC, peaked at 18:07 UTC, and ended at 18:25 UTC.
Elevated geomagnetic activity was recorded on Earth on June 13, 2025, due to the waning effects of a negative polarity coronal hole high-speed stream and possible transient effects.
An S1 – Minor solar radiation storm began at 17:00 UTC on May 31, 2025. The storm is linked to a long-duration M8.1 solar flare from Active Region 4100 at 00:05 UTC on May 31. Minor HF radio signal fades are being reported at high latitudes.
