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Ursa Astronomical Association
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Ursa Astronomical Association

Half-sky auroras - 27.2.2012 at 21.10 - 27.2.2012 at 21.45 Tampere Observation number 2226

Visibility IV / V

Esa Palmi, Ursa (Länsi-Suomi)

By the first stage of the evening, it took time for the badminton shift, but the alarms on the phone gave additional hope. At home, the conclusion of the curves and the shore of Lake Näsijärvi to use. When Jari Ylioja, a large northern lights magnet, was also visiting the place, Jari joined us to enhance the play :) That's where we watched the event on a suitably plowed ice road. I don't remember seeing a similar play in Tampere in the digital age. The best phase lasted about 5 minutes, when the entire lake cover warped green and a fine "hole" became in the zenith. Even after this, the dim northern lights would illuminate the distant sky on the horizon.

But something bad. The surface mist arriving on the lake from the direction of Pispala and Lielahti reduced the visibility so much that the best blade left the pictures. In addition, the new camera was in proper use for the first time. The wire trigger has not yet arrived and 1 pipe so far, so the challenge was enough.

More similar observations
Additional information
  • Aurora brightness
    • Bright auroras
  • Colors with unaided eye and other features
    • Flaming auroras info

      Flaming. This rare subclass of aurora does not mean so much a single shape, but a large area in the sky. In the flaming aurora, bright waves that are sweeping upward towards the magnetic zenith emerge in the sky. Very rarely waves can wipe downwards. Bands are usually reported during flaming, less often spots.

    • Pulsating auroras info

      Pulsating aurora. The brightness of the pulsating aurora usually varies rhythmically over a period that can be only a fraction of a second at its fastest, but can also be several minutes. Pulsing usually only occurs in(strong auroral conditions) higher quality shows , especially towards the end of them. However, the pulsation may be followed by yet another eruption. Sometimes the variation in brightness is at the same stage in the whole form, whereby the whole form "turns on and off" at the same time. Pulsation is also found in arches and bands, but above all in spots..

    • 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.

    • Red coloration of the shapes lower edge info

      Red lower edge visible with the naked eye. The bands which are starting to level up their activity and are green colored have quite often a narrow red lower edge. This is the most common form of red color which is derived from molecular nitrogen.

      Aurora band with purple lower edge. Photo by Ilmo Kemppainen.

      The low hanging brightest aurora band is colored red at the lower edge. Photo by Tero Ohranen.

      Narrow purple reddish tones at the lower part of this aurora band. Photo by Merja Ruotsalainen.

      Purple band at the bottom. Photo by Panu Lahtinen.

    • 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
    • ;Rays;Band;Arc;Veil
Technical information

Pentax K-5 18-135 mm

Comments: 1 pcs
Marko Pekkola - 6.4.2012 at 23.59 Report this

Revontuliluokitukseen on nyt lisätty sykkivien ja loimuavien rinnalle myös loput kaksi harvinaista luokkaa: liehuvat (streaming) ja lepattavat (flickering).

Kun kerran sinulla oli tässä sekä sykkivät että loimuavat, niin kannattaa ehkä tarkistaa oliko jokin noista muistakin.

Toivomasi vyön ja kaaren eron selkeyttäminen ohjeissa on nyt tehty sekä demokuvanökymässä pikkuteksteillä että lomakkeen alaosan infonapeissa.

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