Quiet aurora arc - 25.2.2023 at 19.30 - 26.2.2023 at 01.15 Pori Observation number 112399

Visibility II / V

Petteri Ahonen, Porin Karhunvartijat

quite strong, but otherwise very calm arc all evening, not that big of a life.

https://www.youtube.com/watch?v=9sTnRgeqDqU

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Additional information

Aurora brightness
- Dim auroras
Observed aurora forms
- Band
  
  Bands are usually narrower, more twisty at the bottom, brighter, and more active than arches. Bands usually develop from arches.
  
  Bands can form J and U shapes, sometimes even full spirals. The corona can also arise from bands. Bands are a fairly common form of aurora.
  
  Aurora band. Photo by Merja Ruotsalainen.
  
  Aurora band. Photo by Matias Takala.
  
  Aurora band. Photo by Lea Rahtu-Korpela.
  
  Aurora bands. Photo by Lauri Koivuluoma.
  
  Aurora band. Photo by Matias Takala.

Colors with unaided eye and other features
- 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.

Technical information

Nikon d7200, Samyang 16 f2

6s, F2-2.5, iso1600

in timelapse, a total of just under 900 frames

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Quiet aurora arc - 25.2.2023 at 19.30 - 26.2.2023 at 01.15 Pori Observation number 112399