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Ursa Astronomical Association
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Ursa Astronomical Association

Half-sky auroras - 7.10.2015 at 21.00 - 7.10.2015 at 21.30 Espoo Observation number 43812

Visibility IV / V

Great evening by the pond. Although there were occasional overcast clouds in the sky, it did not dim the brightest northern lights. At its best, the green gauze appeared almost full of the sky, and even to the south, tense spots developed (last picture), ones I had never seen before.

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Additional information
  • Aurora brightness
    • Bright auroras
  • 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.

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