CME IMPACT AND GEOMAGNETIC STORM: Arriving a full day earlier than expected, a CME hit Earth’s magnetic field on July 16th: data. The impact at 1920 UT caused a 20 nT jolt in the USGS’s magnetometer at Fredericksburg, Virginia, and a G1-class geomagnetic storm. More CME impacts are possible on July 17th and 18th due to multiple recent eruptions from big sunspot AR3363.
https://spaceweather.com/
Ydun Ritz (2023-07-17)