Aurora borealis over Sejerø Bugt I   112294
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1 Sejerø Bugt
2 Sejerø lighthouse, 23 km
3 Sejerø city
4 Sjællands Odde ferry harbour, 34 km
5 Lumsås, 40 km
6 Vejrhøj 121 m, 24 km


Location: Kallerup Bakke (60 m)      by: Jan Lindgaard Rasmussen
Area: Denmark      Date: 2017-04-21, 23:47
A typical aurora borealis display from Denmark. This would most likely have been visible from northern Germany as well. On this particular evening, I communicated with a friend in Jämtland, Sweden, at 63 degrees latitude, who told me that "it is all green here!". When viewing this live, it is important to stress, that it appears more or less colourless, like the lights from a big city. At most one can sense some green teint. The blue and magenta is however not possible to see - it is picked up by the camera on long exposure times. The brighter rays appear like actual sudden, brighter, rays that can glow clearly for severel seconds. These are the highlights of an borealis evening, and can even bright up the landscape.

If one wants to try ones luck on this subject, you must in advance have found a dark spot with a clear view to a northern horizon, that you can go to within a relative short space of time. Also make sure the moon is not up. Otherwise forget it! Then, you must check out some spaceweather. There are severel aurora forcast apps, but predictions are usually very uncertain. Although coronal mass ejections take some time to reach earth, it is quite unpredictable what side of the globe they splash into, and the intensity as well as direction. I therefore check the spaceweatherstation in Kiruna, Sweden, if the nightsky is clear and dark. Then I can see if something is brewing. In Denmark, the K-index needs to be at least 5-6. On this evening, it was 7. 8-9 will most likely be visible in Saxony. Check it here:[Magnetometers]=Data

As can be seen on aurora panos from Iceland, it is like moving bands overhead. This position is appr. 1000 km to the south, and aurora will appear as a glow in the northern horizon. The vertical field of view with this lens must be about 26 degrees on a full frame camera. In this mostly uncropped pano, aurora fills up more or less this vertical angle.

On my test site, #10164, you can see how little was left of it 30 minutes later

Pano made from 6 pics (RAW), 50 mm, Canon 6D, tripod, iso-5000, f/3,2, 1/13 sek, developed in DPP (3800K, neutral, low sharpness, periphal illumination 100), stitched in PTGui pro, contrast in Gimp, downscaling and sharpening in Irfanview.


Ziemlich beeindruckend. LG Arno
2017/10/13 23:26 , Arno Bruckardt
Jeezes, I wish I was there. This show is extremely rare in the Netherlands. The very high red aurora's sometimes could be seen. Very well photographed, Jan.
2017/10/14 00:07 , Mentor Depret
Yes typical for your area indeed and very beautiful. This one I remember well because it was very well visible by camera and weak by eye in my area on dark places (and even more south in czech repuplic), but I was not able to go out that night....arghhh. Visible beams like yours are extremly rare here.
Good explanation, I would add some info even for the large part of us here, (living more south) because every aurora is different. High K-index is a good indicator, but no guarantee. It happened on the event around september 09th for example. K-index was 8 over longer time in Potsdam, but allmost nothing happened on dark sky. The main event was in the afternoon and it came not back strong at midnight as often happened in past.

Some usefull links:
2017/10/14 05:30 , Steffen Minack
Absolutely stunning atmosphere - wonderful taken, dear Jan ... and thanks so much for your helpful description, great !!!

Cordial greetings, Hans-Jörg
2017/10/14 15:46 , Hans-Jörg Bäuerle
What an eyecatcher :)
2017/10/14 20:27 , Silas S
Great pano!
2017/10/14 21:12 , Jens Vischer
Da können wir in unseren Breiten nur von träumen. Gelegenheit gut genutzt und gut gemacht.
2017/10/15 14:19 , Dieter Leimkötter
Meine herzliche Gratulation zu diesem außergewöhnlichen Erlebnis, daß Du in ausgezeichneter Qualität festgehalten hast!
2017/10/15 19:19 , Friedemann Dittrich
Amazing scenery - amazing colours!
LG Jörg
2017/10/15 19:23 , Jörg Nitz
Thank you for all your envious comments :-D

In addition to Steffens comment and links can be said, that in spite of a large observed coronal mass ejection (usually that gives us a warning of 1-2 days) and a high K-index afterwards, there are still 3 parameters, that need to work together to make a show: the direction needs to be right (on the Kiruna-curve the black line; needs to go south = downwards), the mass needs to be considerable (otherwise just a deluted colour experience), and finally the speed must be good (otherwise just a very narrow band in the horizon).

Also can be said, that the above shown happens 1-2 times a month in Denmark, but because of the moon and clouds one is not often lucky. Last spring had a period from late march to late april with 4 of these happenings, thanks to mostly to clear weather. Late winter is the best time usually, with february to april being our driest months. And also we are now at a lowpoint in the suns 12 year cycle of mass ejections; therefore we should see an increase in events over the next decade hopefully.
2017/10/18 20:10 , Jan Lindgaard Rasmussen
2018/01/08 23:19 , Christoph Seger

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Jan Lindgaard Rasmussen


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