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Update #2: Mid-October Aurora Reached G2 storming, G3 predicted

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Northern Lights Now – The predicted G1, then upgraded to G2, aurora predicted for October 13-15 is meeting and exceeding expectations. KP values recorded in 3-hour increments by the airforce and SWPC were registering between G1 and G2 for much of the day. KP predictions from the Wing-KP model ranged from 4.67 to 7.67 from Noon GMT through Midnight GMT. SWPC has upgraded the watch level on the 14th to G3. Storming will likely only reach that level if the storm continues to intensify – and there have been some hints that it is starting to wane. Here is the chart showing today’s recorded geomagnetic activity:

Global Geomagnetic activity recorded on Oct 13 in 3-hour increments
Global Geomagnetic activity recorded on Oct 13 in 3-hour increments

At the peak of today’s storm the Bz had rotated powerfully to the south, registering as much as -20 nT. This is some of the strongest negative orientation of the Bz since the Saint Patrick’s day storm of 2015. In addition to being strongly south, the field maintained that orientation for a long time. As of this writing, the Bz had been negative for almost 20 hours. This is the longest duration negative Bz since NLN started producing this graphic that shows the duration certain important thresholds for aurora have been exceeded:

NLN Solar Wind Charts show long duration and powerfully south oriented Bz and strong Bt too
NLN Solar Wind Charts show long duration and powerfully south oriented Bz and strong Bt too

With a storm this strong, we’d normally expect to see many wonderful aurora pictures rolling in from our readers and aurora hunters. However, there were a lot of clouds in the normal viewing locations. In NLN’s HQ city of Burlington Vt it was raining most of the day and is cloudy this evening. The Moon is also nearly full, currently at 94% visible, and is washing out the aurora for people who have clear skies. That isn’t stopping photographers, and there are a few beautiful pictures rolling in. Here are a few. Please tag @northlightalert in your photos if you’d like to have them featured in the NLN blog!

Ontario got in on the action:

And upstate New York in Rochester:

Behind a tractor in Wisconsin:

Just a hint from Ireland:

December 2015 Aurora Among Best of Solar Cycle 24

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Northern Lights Now – A solar storm resulting from a pair of CMEs arrived at Earth on December 19, 2015 and induced 30 hours of G1-G2 aurora activity. It proved to be one of the strongest geomagnetic storms of solar cycle 24. Aurora hunters around the world were able to capture stunning photographs of green, red, pink, and purple swirling through the sky. NLN will be writing a complete recap post, but here is a teaser of amazing tweets that has been in the NLN feed over the last two days.

Rob Write Photos – based in Maine from the evening of Dec 20 just after sunset:

Peter Caltner share this, showing the Aurora as far south as the Austrian Alps:

In Ireland, reports came in from Waterford. Here’s a picture from Waterford of the aurora with purple mixed in by Rónán McLaughlin:

Jake Stehli caputured this set of pictures in Wisconsin on the first night of the storm, just as it was really kicking up.

And one of our favorites of this storm so far by KW photography:

Happy Hunting