Coronal mass ejection arrival
Sunday, 16 July 2017 09:47 UTC
The anticipated coronal mass ejection from the M2.4 solar flare has arrived at Earth. It arrived at DSCOVR at 05:15 UTC which is about 9 hours earlier than we expected, and more than 15 hours earlier than the NOAA SWPC expected.
The solar wind speed increased to about 450km/s which is fairly slow considering the relatively fast transit time of this CME. This is a bit puzzling as solar wind speeds of about 600km/s are to be expected with CMEs that have a transit time of 2 days but we have to assume this is the M2.4 CME as there were no other CMEs expected to arrive.
The strength of the IMF has now increased to well over 20nT and the north-south direction of the IMF (Bz) has now dipped strongly southwards peaking as low as -22nT. Excellent values for increased geomagnetic activity.
A moderate G2 geomagnetic storm watch remains in effect for the remainer of this day. With the current values, we shouldn't even exclude a strong G3 geomagentic storm.
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
X1.1 solar flare with earth-directed CME
Sunspot region 3615, G1 watch
X6.3 solar flare
Latest forum messages
Support SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/03/28 | X1.1 |
| Last M-flare | 2024/04/18 | M1.2 |
| Last geomagnetic storm | 2024/04/16 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2024 | 104.9 -19.8 |