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Beautiful sub-auroral arcs across the sky: what we know so far about the phenomenon

October 14, 2017

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Aurora tricks

April 22, 2016

Saturday 9th of April, 2016, 9:00 PM. I am 5 hours away from going to the airport for my Tenerife vacation. I Had looked at my Aurora alert tweets days before, and the aurora forecast looked promising, but the Danish weather was really uncertain. 9:30 PM, clear skies. I look at my twitter again. The Kp is skyrocketing to 4.67 in a few moments! I grab my two cameras, bagged on the shelf, and storm out of my house. I hadn't packed anything for my vacation week. I doesn't matter when it comes to Mother Aurora, so rarely seen here because of the weather...

As I am driving north towards Esterhøj on Sjællands Odde, I can already distinguish the familiar arc. I know something is about to happen and my heart is pounding out of my chest. I am running up the stairs on top of the hill and quickly set up my two cameras. I set up a time-lapse on the a7r2 and I can already witness some beautiful firework on the back of my LCD screen: 

While the time-lapse is running, I decide to make a little experiment. I had bought an Astronomik CSL-filter the week before and wanted to try it out and see what happened with the northern lights. Well, it filtered all the green glow and all that was left was the magenta and purple colors. I think I need to practice with the filter on a night-sky without Auroras.

12:00 AM, the Aurora show subsides and it actually turns out to be perfect timing, because I still hadn't packed anything. I returned home with lots of beautiful pictures that I will process on the plane to Tenerife, packed and left 2 hours later. "You can sleep when you die" as I say.

 

After processing the time-lapse, I noticed two things I had never witnessed before:

 

1) A shooting star big enough to create a sublimation cloud visible for 5 minutes.

2) a second arc of Aurora high in the sky, enabled by the Kp 6 storm.

Go have a look at my Facebook page for the time-lapse!

 

 

 

 

 

 

 

 

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