Half-sky auroras - 10.4.2018 at 23.22 - 11.4.2018 at 00.05 Kuusamo, Käylä Observation number 72759

Visibility IV / V

Jani Päiväniemi, Ursa (Pohjois-Suomi)

I followed the northern lights as soon as it started to get dark. The first show started at 11.20pm and the second just before midnight. It was quieter after that and I couldn’t control it. Gif of the best moment.

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11 5

Additional information

Aurora brightness
- Bright auroras
Colors with unaided eye and other features
- Flaming auroras
  
  Flaming. This rare subclass of aurora does not mean so much a single shape, but a large area in the sky. In the flaming aurora, bright waves that are sweeping upward towards the magnetic zenith emerge in the sky. Very rarely waves can wipe downwards. Bands are usually reported during flaming, less often spots.
- Pulsating auroras
  
  Pulsating aurora. The brightness of the pulsating aurora usually varies rhythmically over a period that can be only a fraction of a second at its fastest, but can also be several minutes. Pulsing usually only occurs in(strong auroral conditions) higher quality shows , especially towards the end of them. However, the pulsation may be followed by yet another eruption. Sometimes the variation in brightness is at the same stage in the whole form, whereby the whole form "turns on and off" at the same time. Pulsation is also found in arches and bands, but above all in spots..
- Green auroras
  
  Green, seen with the naked eye, is one the most common colors of the aurora. The green color is derived from atomic oxygen.
  
  Green auroras. Lea Rahtu-Korpela.
  
  Green auroras. Photo by Juha Ojanperä.
- Violet auroras
  
  Usually in Lapland or even in the south you can see purple auroras in stronger aurora shows. The most common color in auroras along with green and red.

Observed aurora forms
- ;Veil;Rays;Band;Arc

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Half-sky auroras - 10.4.2018 at 23.22 - 11.4.2018 at 00.05 Kuusamo, Käylä Observation number 72759