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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Active aurora band - 13.10.2016 at 21.53 Kyyjärvi Observation number 57928

Visibility III / V

Juha Kinnunen, Jyväskylän Sirius

This demonstration was an excellent example of how the Bz component of the interplanetary magnetic field alone can produce powerful northern lights. After all, both the speed and the density of the solar wind were at very normal levels all the time, but Bz was at the level of -10 ...- 20 continuously for as much as 12 hours.

The road around Jyväskylä was in a cloud, so I drove in the direction of Suomenselä, and soon after Saarijärvi the sky became quite clear. In many places, however, there was dense fog.

More similar observations
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.

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

      Clearly blue auroras can be seen only during the best aurora displays close to the maximum phase or soon after it. Sometimes blue auroras can be seen shortly after the sunset at the top part of the auroral shapes, specially rays. It is created by the mission of the ionized nitrogen molecules created by the suns radiation.

      Strongly colored blue auroras. Photo by Jorma Mäntylä.

      Blue top parts of the aurora. Image by Tom Eklund. 

      Blue top parts of the aurora. Image by Jaakko Hatanpää.

      Partly blue corona. Photo by Tapio Koski.

      Faintly blue top parts of an aurora veil. Photo by Jaakko Hatanpää.

    • 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

Nikon D800, Nikkor 14 mm / f2.8

Comments: 2 pcs
Tommi Järvilehto - 14.10.2016 at 16.13 Report this

Hieno kuva! Kuu ei saanut nujerrettua reposnäkymää.

Janne Kari - 16.10.2016 at 20.08 Report this

Jokainen reposia kuvannut tajuaa heti miten kova tykitys on ollut. Huikea kuva.

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