CME passage, G1 geomagnetic storm

Saturday, 11 May 2019 12:51 UTC

CME passage, G1 geomagnetic storm

The minor G1 geomagnetic storm was reached earlier today at 02:20 UTC. This is caused by a coronal mass ejection passage that brings a persistent southward pointing magnetic field with it. This coronal mass ejection that we are seeing at Earth right now is likely the coronal mass ejection that we posted about on 8 May.

A shock in the solar wind was detected yesterday by DSCOVR around 17 UTC which signaled the imminent arrival of the coronal mass ejection. The coronal mass ejection didn't look very strong at first but the north-south direction of the interplanetary magnetic field (Bz) quickly turned mostly southward resulting in minor G1 geomagnetic storm conditions during the European night hours. The solar wind speed remains low at 350km/s but the north-south direction of the IMF (Bz) remains southwards now near -10nT which means more aurora at high latitudes remain possible in the hours ahead.

Any mentioned solar flare in this article has a scaling factor applied by the Space Weather Prediction Center (SWPC), the reported solar flares are 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.

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! Never want to miss out on a space weather event or one of our news articles again? Subscribe to our mailing list, follow us on Twitter and Facebook and download the SpaceWeatherLive app for Android and iOS!

Latest news

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!

SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/12/08X2.2
Last M-flare2024/12/25M4.9
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024115.2 -37.3
Last 30 days120.1 -38.2

This day in history*

Solar flares
12011M5.77
22024M4.9
32024M2.8
41998M1.83
52001M1.76
DstG
11988-85
21998-57
31978-57G2
42014-49
52002-39
*since 1994

Social networks