G3 – Strong geomagnetic storm observed, aurora as low as New Mexico after June 30 CME impacts Earth
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July 4, 2026
A coronal mass ejection (CME) associated with the June 30, 2026, solar flare reached Earth on July 3, triggering a geomagnetic disturbance that intensified to G3 – Strong storm levels early July 4.
Source
Discussion in the ATmosphere