All-sky aurora - 7.9.2015 at 22.30 Keminmaa Observation number 42116

Visibility V / V

Joni Alavesa

Pretty comets reposet, fill the sky.

Active movements and variations in brightness, but overall relatively dim. Comic to watch anyway! So wide that the eyes are not enough. The camera also stayed in Tornio

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Additional information

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

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

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All-sky aurora - 7.9.2015 at 22.30 Keminmaa Observation number 42116