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Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Quiet aurora arc - 14.1.2022 at 23.15 Hamina Observation number 104086

Visibility II / V


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



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Additional information
  • Aurora brightness
    • Dim auroras
  • Observed aurora forms
    • Dunes info

      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 Report this

todella edustava kuva dyyneistä! Onnea! 

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