All-sky aurora - 18.3.2015 at 00.30 - 18.3.2015 at 01.30 Kurikka, Jurva Observation number 35475

Visibility V / V

Timo Nevala

Awesome northern lights spectacle, whose photographs shine even brighter than at night when viewed with the naked eye.

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Additional information

Aurora brightness
- Very bright auroras
Colors with unaided eye and other features
- Flickering auroras
  
  Flickering. This rare subclass refers to a situation where irregular variations in brightness occur in aurora, such as in fluttering flames.
- 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..
- Blue auroras
  
  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.
- Red coloration of the shapes top
  
  Auroras which have red top part that can be seen with naked eye are most often observed in the bands and long rays. In this case the lower parts are usually green. If the upper parts are in sunlight, red may be stronger than green. This shade of red is due to the discharge of the excitation state of the atomic oxygen.
  
  Aurora that shift to reddish towards the top. Photo by Karri Pasanen.
  
  Red top in a aurora band. Photo by Simo Aikioniemi.
  
  Red at the top of the aurora. Picture of Tom Eklund.
- 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.
- White auroras
  
  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
- ;Veil;Rays;Band;Corona;Arc

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All-sky aurora - 18.3.2015 at 00.30 - 18.3.2015 at 01.30 Kurikka, Jurva Observation number 35475