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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

All-sky aurora - 17.3.2015 at 22.00 - 18.3.2015 at 01.45 Espoo Observation number 35393

Visibility V / V

Pyry Ekholm, Pollux, Aalto-yliopisto

I am not very easily made to leave the shooting practice in the middle, but the messages from the northern lights visible all over the sky were enough, a bow to the package and to the yard.


A small unlit field next to Vermo was chosen as the observation site. When we arrived at the scene, there were already dim northern lights up to the zenith, here and there brighter spots. After a while, there was a spectacularly pulsating and blazing performance of the whole sky. Sometimes dimmer, sometimes brighter. The final phase seemed to begin shortly before, just after the camera’s memory card had become full and the camera had fogged up. The rather bright and still insanely fast-changing northern lights were impressive to follow.


The colors were used all, alone and separately, in turn and simultaneously.



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Additional information
  • Aurora brightness
    • Bright auroras
  • Colors with unaided eye and other features
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      Streaming. In streaming aurora fast irregular variations in brightness occur along the horizontal dimension of homogeneous shapes.

    • Flickering auroras info

      Flickering. This rare subclass refers to a situation where irregular variations in brightness occur in aurora, such as in fluttering flames.

    • Flaming auroras info

      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 info

      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..

    • Blue auroras info

      Clearly blue auroras can be seen only during the best aurora displays close to the maximum phase or soon after it. Sometimes blue auroras can be seen shortly after the sunset at the top part of the auroral shapes, specially rays. It is created by the mission of the ionized nitrogen molecules created by the suns radiation.

      Strongly colored blue auroras. Photo by Jorma Mäntylä.

      Blue top parts of the aurora. Image by Tom Eklund. 

      Blue top parts of the aurora. Image by Jaakko Hatanpää.

      Partly blue corona. Photo by Tapio Koski.

      Faintly blue top parts of an aurora veil. Photo by Jaakko Hatanpää.

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      Yellow aurora color that can be seen with naked eye is a rarity that can arise from suitable combinations of green, red, and blue in bright shows.

    • Fully red auroras info

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      Throughout red aurora. Photo by Tobias Billings.

    • Red coloration of the shapes top info

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      Aurora that shift to reddish towards the top. Photo by Karri Pasanen. 

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    • Red coloration of the shapes lower edge info

      Red lower edge visible with the naked eye. The bands which are starting to level up their activity and are green colored have quite often a narrow red lower edge. This is the most common form of red color which is derived from molecular nitrogen.

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    • Green auroras info

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    • White auroras info

      Paljain silmin valkoinen väri näkyy useimmiten himmeissä näytelmissä, kun silmä ei kykene erottamaan mitään varsinaista väriä. Harvoin kirkkaissa näytelmissä valkoinen väri voi myös syntyä sopivista vihreän, punaisen ja sinisen yhdistelmistä.

  • Observed aurora forms
    • ;Form not identifiable;Veil;Rays;Band;Corona;Arc
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