Coronal hole faces Earth

Friday, 14 September 2018 15:15 UTC

Coronal hole faces Earth

The previous coronal hole solar wind stream gave us some great auroral displays around the world as it caused moderate G2 geomagnetic storm conditions on 11 September which was predicted perfectly by the NOAA SWPC. Today we have yet another coronal hole facing our planet which should be exciting news for aurora watchers at high latitude locations!

We are dealing with a transequatorial coronal hole today. This coronal hole changed quite a bit since it last faced our planet. The speed of the solar wind reached well over 600km/s last time around but the interplanetary magnetic field never really cooperated and a maximum of Kp4 (active geomagnetic conditions) were recorded on 20 August.

Similar stats are likely this time around when the high speed solar wind stream from this coronal hole arrives. This could occur in about three days from now which would be on Monday, 17 September. Active geomagnetic conditions (Kp4) are once again likely with a chance for minor G1 geomagnetic storm conditions. Considering we are so close to the equinox, this should also be taken into account as solar storms can be stronger than expected around the equinoxes.

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!

100%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/11/06X2.39
Last M-flare2024/11/10M9.3
Last geomagnetic storm2024/11/09Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
October 2024166.4 +25
November 2024186 +19.6
Last 30 days163.1 +14.2

This day in history*

Solar flares
12004X3.67
22013X1.62
32024M9.3
42024M4.2
52002M3.47
DstG
12004-263G4
21991-144
32000-95G2
41998-93
51975-67G2
*since 1994

Social networks