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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Active aurora band - 10.4.2018 at 23.55 - 11.4.2018 at 04.36 Asikkala Observation number 72917

Visibility III / V

Samuli Ikäheimo, Lahden Ursa

The idea was to record the zodiac light at the beginning of the night and the Milky Way at the end, but upon reaching Pulkkilanharju, the warp of the northern lights took most of the attention.

The presentation was quite colorful, including, in addition to the normal greenish-yellow flutter, also a broader blue-violet color, especially in the higher parts, and a shade of red at the lower edges of the most active shapes.

Interestingly, in the first half of the night, the northern lights were mostly farther north, with internal movement strongly westward; as the morning approached, however, the arch moved closer to the south and west, an internal movement fluttering toward the east.

The movement of the fires was visible from the bluish sky for another half of the five countries as the rams packed, with the sun about six degrees below the horizon.

Images larger in the gallery (also includes previous spring repo photos):

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

      Streaming. In streaming aurora fast irregular variations in brightness occur along the horizontal dimension of homogeneous shapes.

    • 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 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
    • ;Veil;Rays;Band;Arc
Comments: 1 pcs
Juha Parvio - 13.4.2018 at 19.33 Report this

Hienoja kuvia! Pulkkilanharjulta taitaa olla hyvät näkymät joka suuntaan.

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