• CME impact and high-speed stream forecast to enhance geomagnetic activity through September 8

    ByTeo Blašković

    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.

  • Prominence eruption produces large CME off southeast limb

    ByTeo Blašković

    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.