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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Active aurora band - 4.11.2018 at 19.50 - 4.11.2018 at 21.50 Hyvinkää, Ahdenkallio Observation number 79144

Visibility III / V

The clear starry sky and the predictions of the northern lights are buzzing, so we had to go and see if something could be seen. Upon reaching the observation site, the northern sky fluttered green. 2 arches one of which rose over the big Otava. Momentary activity below the lower arc. The upper arc rose closer to the zenith during which the SAR arc also appeared to be visible. after a while the upper arch faded and spots appeared in the sky. The lower arch wobbled brightly and it looked like the show had been patted until around 21.26 the arc started to activate, offering stunning rays and different shapes. This phase could always be described at. Until 21.40 until the play faded and it was time to pack up the equipment and shave towards home. Nice 2 hour cameras for outdoor activities.

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Additional information
  • Aurora brightness
    • Bright auroras
  • Colors with unaided eye and other features
    • Red coloration of the shapes top info

      Auroras which have red top part that can be seen with naked eye are most often observed in the bands and long rays. In this case the lower parts are usually green. If the upper parts are in sunlight, red may be stronger than green. This shade of red is due to the discharge of the excitation state of the atomic oxygen.

      Aurora that shift to reddish towards the top. Photo by Karri Pasanen. 

      Red top in a aurora band. Photo by Simo Aikioniemi.

      Red at the top of the aurora. Picture of Tom Eklund.

    • 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.

  • Observed aurora forms
    • ;Veil;Rays;Band;Arc
Technical information

Canon 5D Mark IV Sigma 14mm F / 1.8 DG HSM ART Canon 5 DSR Tamron SP 15-30mm F / 2.0 DI VC USD

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