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Ursa Astronomical Association
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Ursa Astronomical Association

Active aurora band - 17.4.2021 at 00.31 - 17.4.2021 at 00.37 Oulu Observation number 97955

Visibility III / V

Kari Kaila, Oulun Arktos

There were some great northern lights on several nights in mid-April. Attached is the beginning of the northern lights eruption from the night of 16.-17.4. 00: 31-00: 37. Pictures are taken every minute in the direction of zenith. There were strong pulsating northern lights before the eruption, but especially after the eruption until the morning began to lighten. Shutter speeds 1.00 seconds.

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Additional information
  • Aurora brightness
    • Bright auroras
  • Observed aurora forms
    • Corona info

      CoronaA corona is a hand fan shaped structure, it usually forms south of the observer's zenith, most commonly consisting of rays or bands. The corona is usually the most beautiful part of the aurora show. It is bright and active, but on the other hand also short-lived.

      Aurora corona. Photo by Anna-Liisa Sarajärvi.

      Aurora corona. Photo by Merja Ruotsalainen.

      Corona formed from bands. Photo by Markku Ruonala.

      Aurora corona. Photo by Tapio Koski.

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