X9.3 earth-directed coronal mass ejection

Wednesday, 6 September 2017 - 21:09 UTC

X9.3 earth-directed coronal mass ejection

The wait is over. We finally have a complete set of SOHO/LASCO coronagraph images from today's memorable X9.3 solar flare. If you missed today's space weather events be sure to read this news article before you continue reading here.

As most of you probably already suspected, the eruption was very broad and the plasma cloud indeed has an earth-directed component. The animation below shows you the coronal mass ejection as seen by the SOHO LASCO C2 and C3 coronagraphs.

Animation: SOHO LASCO C2 and C3 difference footage showing the X9.3 coronal mass ejection as it is ejected into space.

We see a clear asymmetrical full halo coronal mass ejection with the bulk of the CME heading well towards the south-east. It does seem that sunspot region 2673 has rotated a bit too far to the west already for a real head on collision with the plasma cloud. Nonetheless there is a clear earth-directed component and an impact is likely to occur.

We estimate the bulk speed of this coronal mass ejection to be in the 1.700 to 1.800km/s range which is fairly fast but the flanks do seem quite a bit slower which makes this a very tricky situation. We also need to factor in the M5.5 CME which is still on it's way as that will also affect how much the X9 CME will decelerate. All in all a very complex situation but we estimate that a 42 hour transit from the Sun to Earth seems plausible meaning the plasma cloud could arrive at Earth around 06:00 UTC this Friday, 8 September 2017. As always there is a healthy amount of uncertainty with these impact times but it should give a rough idea when to expect enhanced geomagnetic conditions. It will be interesting to see what NOAA's ENLIL model is going to predict.

While the solar flare was strong, we doubt it's coronal mass ejection is going to cause a truly large (G4 or G5) geomagnetic storm due to the reasons stated above. We suspect that moderate G2 geomagnetic storm conditions will be possible on 8 September with a chance of isolated periods with strong G3 storm conditions.

Never want to miss one of our news articles again? Subscribe to our mailing list! Always want to be up to date of the latest space weather events? Our Twitter account is the place to be for the latest space weather alerts or if you don't have Twitter you can sign up for the push alerts! Unsure what all of this space weather tech talk means? Our help section is the place to be where you can find in-depth articles, a FAQ and a list with common abbreviations. Do you still have a burning question after digging trough our help section? You are more than welcome to post on our forum where we will personally help you the best we can!

Current data suggest that it is not possible to see aurora now at middle latitudes

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 20% 15%
Middle latitude 5% 1%
Predicted Kp max 3
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
New Moon

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!

100%

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2017/11/08Kp6 (G2)
Number of spotless days in 2017:81
Last spotless day:2017/11/13

This day in history*

Solar flares
12002M7.4
22003M4.5
32003M3.9
42003M3.2
52003M1.8
ApG
1200326G1
2199917
3201515G1
4199614
5199711
*since 1994