Coronal hole faces Earth

Monday, 26 March 2018 - 13:17 UTC

Coronal hole faces Earth

A southern extension of the northern hemisphere polar coronal faces Earth today. 

This coronal hole looks deceptively large on the SDO/AIA 211 Ångström wavelength (Twitter insert below) but a closer look at the 193 Ångström wavelength (header image) reveals we are dealing with a southern extension of the northern hemisphere polar coronal hole. There is a very poorly defined equatorial portion but the 211 Ångström wavelength makes it seem more impressive than it really is. This shows why it is very important to compare the 193 Ångström and 211 Ångström wavelengths with each other, something you can easily do on our dedicated coronal hole page.

We do not expect geomagnetic storm conditions from this coronal hole but with the equinox just behind us, and with a little luck this could again be another interesting event for high latitude (Scandinavia, Alaska, Canada etc.) sky watchers. The stream could arrive on 29 March and active geomagnetic conditions (Kp4) are possible.

Thank you for reading this article! Did you had trouble with some of 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


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!


Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/01/05Kp5 (G1)
Number of spotless days in 2019:14
Current stretch spotless days:15

This day in history*

Solar flares
*since 1994

Social networks