The impact of a full halo coronal mass ejection (CME) at Earth on January 19, 2026, drove geomagnetic activity to G4 – Severe levels, producing widespread aurora across Europe, Asia, and the United States.
A G3 – Strong geomagnetic storm is forecast for November 6 and 7, 2025. The disturbance originates from X-class solar flares and associated coronal mass ejections (CMEs) recorded on November 4, combined with a coronal-hole high-speed stream. Aurora is expected to become visible across much of Canada and the northern United States, possibly reaching as far south as Pennsylvania, Iowa, and Oregon.
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.
