Quiet aurora band - 14.4.2018 at 01.10 - 14.4.2018 at 02.20 Mustasaari Observation number 72973

Visibility II / V

Tommi Järvilehto, Vaasan Andromeda

The dim northern light belt stood out with its bare eyes. There was little activation at once.

Timelapse from 02:00 to 02:20. Green also flashes much higher than the northern lights belt itself.

There is no more astronomical darkness but the orbit stood out to the naked eye.

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Additional information

Aurora brightness
- Very 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

Sony a7, Samyang 14mm crop glass. f / 2, 8sec, ISO6400

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Quiet aurora band - 14.4.2018 at 01.10 - 14.4.2018 at 02.20 Mustasaari Observation number 72973