Coronal mass ejection arrival

Tuesday, 12 September 2017 - 19:54 UTC

Coronal mass ejection arrival

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.

ACE/EPAM plot showing the low energy protons peaking when the CME arrived at ACE.

The CME arrival can be seen clearly with the help of the solar wind and IMF data from DSCOVR.

The solar wind stats are rather mediocre at this moment and no geomagnetic storming (G1 or greater) is expected at this stage but who knows what the future will bring, we do recommend you keep on following all the data live on this website.

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Current data suggest that it is not possible to see aurora now at middle latitudes
The density of the solar wind is moderate (22.75 p/cm3)

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