Diffuse glow - 14.1.2022 at 20.00 - 14.1.2022 at 20.15 Ovanåker, Ruotsi Observation number 104026

• 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

• 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.

Canon 5dIV, ISO 800, Sigma 40mm, f1.4, 5sec.

Comments are checked and moderated before publication If you want to contact the observer directly about possibilities to use these images, use the Media -form.