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The X8.2 coronal mass ejection has arrived. A weak impact was observed at 19:29 UTC with a minor increase in the solar speed, density and the total strength of the interplanetary field (Bt). This is without a doubt the glancing blow arrival of the X8.2 coronal mass ejection as the low energy protons measured by ACE/EPAM peaked at the moment of impact, a classic sign of a CME arrival.
|Predicted Kp max||3|
|M-class solar flare||1%|
|X-class solar flare||1%|
|B1.2 B1.7 B1.4 B1.5 B3.2 B5.4 B8.4|
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|Last geomagnetic storm:||2017/09/18||Kp5 (G1)|
|Number of spotless days in 2017:||56|
|Last spotless day:||2017/08/01|