Earth’s magnetic field reached G3 – Strong storm levels on September 30, driven by CME impacts and sustained southward IMF. The event was enhanced by seasonal Russell–McPherron geometry near equinox, increasing coupling efficiency. Storm strength has since eased to G2 and G1 as IMF weakened and Bz returned closer to neutral.
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 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.
