Quiet aurora band - 15.3.2018 at 20.15 - 16.3.2018 at 01.30 Kouvola Observation number 71615

Visibility II / V

Rauni Pakkala

Last night, an early departure came out, when the fb group started to have messages that are now visible. It was worth rushing, as the early evening show was quickly over. In the photos, a green gauze stood out in the sky even after the best warps disappeared. I happened to wake up again after midnight and when a test shot from the kitchen window showed green again behind the trees, I would go outside. The calm arch appeared dim, the photographs needed as early as the 25s that stood out better, with more noticeable life in them.

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13 12

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
- 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.

Technical information

Canon 6D, 24-105mm, f4, 10-25s

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Quiet aurora band - 15.3.2018 at 20.15 - 16.3.2018 at 01.30 Kouvola Observation number 71615