Strong G3 geomagnetic storm

Sunday, 28 May 2017 14:50 UTC

Strong G3 geomagnetic storm

A coronal mass ejection arrived at our planet yesterday and managed to cause an unexpectedly strong geomagnetic storm. The strong G3 geomagnetic storm threshold was reached today at 04:19 UTC.

The impact was weak at first and there was no reason to believe we would be getting such a strong geomagnetic storm. However, around 21:00 UTC last night we entered the core of the plasma cloud causing the Bt to shoot up to a maximum of 22nT and the north-south direction of the IMF dropped to values around -20nT for several hours. The geomagnetic field responded immediately with two 3-hour periods with G2 geomagnetic storming and G3 geomagnetic storming during the 03-06 UTC time window.

The storm sparked amazing auroral displays around the world. Locations like the Netherlands, England, the northern US, New Zealand and southern Australia witnessed brilliant auroral displays.

We will be posting images and videos of this geomagnetic storm on our Facebook page so be sure to like us there!

Header image: Aurora Australis captured in Tasmania, Australia by Sophie Fazackerle.

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.

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