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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Quiet aurora band - 17.4.2021 at 00.00 - 17.4.2021 at 01.30 Asikkala Observation number 97705

Visibility II / V


After all, that gaping wind finally came. As soon as it got dark, the diffuse, pre-storm arc appeared moderately high in the sky, and after midnight then the storm was able to delight. A beautiful play for a long time. The moon was a little distracted, but not everything can always be chosen. Images are not in chronological order. EDIT last image added. The SAR arc in the picture is dimmed. I did not see this with my own eyes. Picture around 2330, before a great downstorm.



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Additional information
  • Aurora brightness
    • Bright auroras
  • Observed aurora forms
    • Stable Auroral Red (SAR) arc info

      The Stable Auroral Red arcs (SAR arcs)  are usually clearly distanced to the south from the aurora oval and is a very opaque and normally red ribbon. In most cases SAR arcs are only visible in the photo or on the liveview screen of the SLR camera. Using a camera with very high sensitivity is the best method for capturing these faint arcs. The arch usually settles between east and west.

      A stable red arc of aurora is a rare phenomenon. In some rare occasions, several SAR arcs may be simultaneously visible.

      The first SAR arcs of the Skywarden were observed on nights between November 3-4. and 4-5. days in 2015 in the latitudes of central Finland.   

      SAR
      SAR arc photographed by Lasse Nurminen 2018. Observation of the Skywarden 79113.

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