Quiet aurora arc - 14.1.2022 at 23.15 Hamina Observation number 104086

Visibility II / V

Heikki Jokiranta

Dull dunes (?) In a northern lights belt that ran across the sky for a short time. Later brighter and more varied fires.

This description has been automatically translated from Finnish. Click here to see the original text.

5 7

Additional information

Aurora brightness
- Dim auroras
Observed aurora forms
- Dunes
  
  Dunes
  
  The dunes are a dim and very rare shape that has so far been associated with the aurora visible in early evening.
  
  Aurora dunes can be most easily confused to ribbons on lower clouds. In order to fill in the description of the phenomenon, a striped pattern formed by parallel lines must also appear in the aurora. The stripes are most easily recognizable right at the front edge of the aurora but they may also occur among the rest of the aurora.
  
  The dune auroras are visible as a parallel striped float. Photo by Tapio Terenius
  
  Raidallisen dyynilautan reunassa voi toisinaan olla voimakastakin aaltoilua.
  
  There can sometimes be strong ripples at the edge of a striped dune float. The rippling of the edge of the dune float can vary from minor to large (pictured). Photo by Pirjo Koski

Comments: 1 pcs

Pirjo Koski - 23.1.2022 at 14.26

todella edustava kuva dyyneistä! Onnea!

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Quiet aurora arc - 14.1.2022 at 23.15 Hamina Observation number 104086

Dunes