Coronal mass ejection arrival

Saturday, 1 July 2017 - 17:26 UTC

Coronal mass ejection arrival

A coronal mass ejection shock arrived at DSCOVR today at 16:27 UTC and it increased the total strength of the interplanetary magnetic field to a respectable 18nT.

This is likely the early arrival of the 28 June CME. DSCOVR registered an increase of the solar wind speed from 360 to 410km/s at impact (confirmed by ACE) and the total strength of the IMF doubled from 9nT to 18nT. The north-south direction of the IMF (Bz) hasn't showed any major deviations yet but this can still occur once the shock passes and we enter the core of the CME.

A minor G1 geomagnetic storm watch is in effect for the coming 24 hours but it is vital for the north-south direction of the IMF (Bz) to turn southward after the initial shock has passed.

Screenshot of the current solar wind stats exactly one hour after its arrival at DSCOVR. Click here.

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Current data suggest that it is not possible to see aurora now at middle latitudes
The solar wind speed is currently moderately high (502.3 km/sec.)

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Auroral activity Minor Severe
High latitude 30% 35%
Middle latitude 10% 1%
Predicted Kp max 4
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M-class solar flare 1%
X-class solar flare 1%
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Waxing Crescent

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