CME arrival? G1 geomagnetic storm

Thursday, 31 August 2017 08:56 UTC

CME arrival? G1 geomagnetic storm

Enhanced geomagnetic conditions are underway as a solar wind structure arrived at DSCOVR this night at about 04:43 UTC. The minor G1 geomagnetic threshold was reached today at 08:23 UTC.

This could be the anticipated coronal hole solar wind stream but the impact signature (sudden rise in speed, density, Bt) makes us suspicious that this might actually be the arrival of a coronal mass ejection. This isn’t as crazy of a theory as you might think it as we did spot a small partial halo coronal mass ejection back on the 28th that came from an eruption on western solar hemisphere. It could be arriving as a glancing blow right now with the coronal hole solar wind stream following in right behind it.

The partial halo coronal mass ejection from 28 August as seen by the SOHO/LASCO C2 coronagraph. 

Whatever it is we may be looking at, it is bringing us some interesting solar wind and IMF stats near Earth and if these values hold we should expect more storming during the remainder of this day. Sky watchers in the northern United States, southern New Zealand and Tasmania should be alert of enhanced auroral displays in the coming hours.

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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