Half-sky auroras - 7.9.2015 at 21.40 - 8.9.2015 at 00.15 Akaa Observation number 42133

Visibility IV / V

Markku Ruonala

An interesting northern lights play. Right at the beginning an active radial belt, but then almost a couple of hours of lazy activity, mostly in the form of arches, which at best had three on top of each other. Finally at 11.20 pm the play was activated and there was a rather spectacular show on offer. The thing ended in pulsating spots and finally as the clouds covered the sky.

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10 5

Additional information

Aurora brightness
- Bright auroras
Colors with unaided eye and other features
- Pulsating auroras
  
  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..
- Green auroras
  
  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: 3 pcs

Arja-Sisko Airila - 8.9.2015 at 01.29

Hienot reposet! Eikös tuossa kuvassa 2 ole myös protonikaari, kuten Mauri Korven kuvassa Ilmajoella?

Markku Ruonala - 8.9.2015 at 08.17

Kiitos kommentista Arja-Sisko. En osaa tunnistaa/erottaa olemassa olevilla tiedoillani protonikaarta normaalista säteistä, siksi tunnistuksenani (todennäköisyyden perusteella) säteet.

Emma Bruus - 8.9.2015 at 09.39

Komppaan tässä Markkua: säteille näyttää minustakin. Silmiä hivelevän komea tuo linnunrata+revontulet otos.

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Half-sky auroras - 7.9.2015 at 21.40 - 8.9.2015 at 00.15 Akaa Observation number 42133