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Contact information

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

Ursa Astronomical Association

Quiet aurora band - 14.4.2018 at 01.10 - 14.4.2018 at 02.20 Mustasaari Observation number 72973

Visibility II / V

Tommi Järvilehto, Vaasan Andromeda

The dim northern light belt stood out with its bare eyes. There was little activation at once.

Timelapse from 02:00 to 02:20. Green also flashes much higher than the northern lights belt itself.

There is no more astronomical darkness but the orbit stood out to the naked eye.



More similar observations
Additional information
  • Aurora brightness
    • Very dim auroras
  • Observed aurora forms
    • Band info

      Bands are usually narrower, more twisty at the bottom, brighter, and more active than arches. Bands usually develop from arches.

      Bands can form J and U shapes, sometimes even full spirals. The corona can also arise from bands. Bands are a fairly common form of aurora.

      Aurora band. Photo by Merja Ruotsalainen.

      Aurora band. Photo by Matias Takala.

      Aurora band. Photo by Lea Rahtu-Korpela.

      Aurora bands. Photo by Lauri Koivuluoma.

      Aurora band. Photo by Matias Takala.

  • Colors with unaided eye and other features
    • Green auroras info

      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.

Technical information

Sony a7, Samyang 14mm crop glass. f / 2, 8sec, ISO6400

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