Coronal mass ejection arrival
Saturday, 1 July 2017 17:26 UTC
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.
Thank you for reading this article! Did you have any trouble with the technical terms used in this article? Our help section is the place to be where you can find in-depth articles, a FAQ and a list with common abbreviations. Still puzzled? Just post on our forum where we will help you the best we can!
Latest news
X1.5 solar flare
M2.7 solar flare, CME arrival possible
Complex sunspot region 4366
Latest forum messages
Support SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Space weather facts
| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/09 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 88.1 +2.2 |
| Last 30 days | 93.2 +32.7 |