A Coronal Mass Ejection (CME) produced by the X9.3 solar flare on September 6, 2017, reached our planet at 23:04 UTC on September 7, 2017, a full day earlier than it was expected. G3 – Strong geomagnetic storming started 23:25 and increased to G4 – Severe at 23:50 UTC. Over the past 24 hours, solar wind parameters, as measured by the DSCOVR satellite indicated continued influence from the

September 4th CME followed by a CME arrival from the September 6th CME at 22:29 UTC. The shock then increased to a peak of 34 nT observed at 22:55 UTC. Bz reached a maximum southward value of -33 nT at 22:57. Solar wind speeds were between 500 – 600 km/s before shock arrival and increased to 623 km/s, further increasing to a peak speed of 751 km/s by 22:45 UTC. READ MORE