Aurora - Height and distance calculation
Taken by Peter Rosén on September 13, 2014 @
Väddö and Uppsala, Sweden
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Date Taken: 2014:10:15 00:29:48
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Details:
Just after midnight on the 13th of September, we were expecting a nice outbreak of northern lights visible north of Stockholm.
I had travelled with a friend to a place 100 km north-east of Stockholm on the seaside hoping for clear skies in time for the display.
I also called Christoffer Svenske, a friend living 85 km to the west from my position, close to the town of Uppsala.
We decided to synchronize our efforts with the hope to be able to triangulate the height and the position of some streaks of northern light.
From the hundreds of pictures that we took, I found just one pair with recognizable common features in both images and taken only 3 seconds apart.
I decided to measure the height and position of one obvious streak (cross-hair 1 and 2) and a more diffuse shape (3 and 4) that seemed to have moved a lot sideway so I expected it to be much closer, which in fact it also proved to be.
I used Paul Schlyters online calculator http://stjarnhimlen.se/calc/metnlcalt_en.html that I have previously used to estimate the distance to a meteor and to NLCs http://spaceweather.com/archive.php?day=12&month=07&year=2014&view=view&PHPSESSID=12btjlh4j44ae4un3guk7rs5d0 .
Our respective positions are marked by a blue bullet for Christoffer and a red one for me.
The height values are displayed next to the cross-hair marks on the background map and the corresponding geographical positions, on the map to the left.
The satellite view of the aurora is just a simulation.
/*Peter R
Photographer's website:
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