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Aurorae

Aurorae

(c) Michael Hunnekuhl

Electrons from the solar wind that encounter the Earth’s magnetic field are the main cause of a phenomenon called aurora. Trapped electrons spiral along magnetic field lines towards two oval zones centered on the magnetic poles. Collisions with high altitude oxygen and nitrogen transfer kinetic energy from the electrons to the atoms and raise their outer electrons in higher energy levels. These energy levels are not stable. Therefore, electrons fall back in lower energy levels. The energy difference is released in the form of light with characteristic colors.

2006-2011 2006/11/24 2007/02/17Aurora Borealis impressions Aurora Borealis impressions Aurora Borealis impressionsNorway Norway, near Tromsø Norway, near Skjervøy

2007/02/17 2007/11/13 2007/11/14 Norway, near Skjervøy Norway, Barents Sea Aurora Borealis + Comet 17P/Holmes Norway, Vardø

2007-2008 2008/11/27 2008/11/27Aurora Borealis impressions Norway, near Tromsø Norway, near Tromsø Norway, Barents Sea

All aurora images shown above were taken on cruises along the Norwegian coast with HURTIGRUTEN.

2010/02/19+23 2011/02/02 2011/02/04Aurora Borealis + moon Norway, Båtsfjord Norway, SvalværNorway, near Tromsø

2011/02/04 2011/02/04 2011/02/04Norway, Svalvær Norway, Svalvær Norway, Svalvær

2011/02/04 2011/02/04 2011/02/04Norway, Svalvær Norway, Svalvær Norway, Svalvær

In the early morning of 23th January 2012 the sun had released a coronal mass ejection (M9-class solar flare) hitting the earth magnetic field on 24th January around 15.00 UTC. The shock wave impact causes a G1-class geomagnetic storm. Details to this eruption can be found here (source: www.spaceweather.com)The following images had been taken in the wilderness of Lapland in Sweden, close to Vildmarksbyn Solberget about 20km south-east of Nattavaara. Visible aurora activity starts in the early evening. The faint aurora glow seemed to cover the whole sky with a thin layer of clouds in the beginning of the activity. Strong aurora activity had been observed between 21.30 and 21.50 UTC.

(c) Michael Hunnekuhl

2012/01/24 19.18 UTC 2012/01/24 19.38 UTC 2012/01/24 19.45 UTC

2012/01/24 21.31 UTC 2012/01/24 21.33 UTC 2012/01/24 21.34 UTC

2012/01/24 21.35 UTC 2012/01/24 20.35 UTC 2012/01/24 21.36 UTC

2012/01/24 21.36 UTC 2012/01/24 21.37 UTC 2012/01/24 21.38 UTC

2012/01/24 21.39 UTC 2012/01/24 21.39 UTC 2012/01/24 21.40 UTC

2012/01/24 21.41 UTC 2012/01/24 21.41 UTC 2012/01/24 21.43 UTC

2012/01/24 21.44 UTC 2012/01/24 21.44 UTC 2012/01/24 21.45 UTC

2012/01/24 21.45 UTC 2012/01/24 21.45 UTC 2012/01/24 21.46 UTC

2012/01/24 21.48 UTC 2012/01/24 21.49 UTC 2012/01/24 21.49 UTC

2012/01/24 21.49 UTC 2012/01/24 21.50 UTC

2012/01/24 19.57 UTC 2012/01/24 19.58 UTC 2012/01/24 20.06 UTC