Half-sky auroras - 18.9.2023 at 22.30 - 18.9.2023 at 23.30 Lahti Observation number 118803

Visibility IV / V

Reima Eresmaa, Ursa (Etelä-Suomi)

Mostly a fairly calm and faint belt type across the expanse of half the sky. Sometimes a little more active movement and sometimes even enough bright spots to be reflected on the broken surface of Lake Vesijärvi. Half a dozen other enthusiastic independent observers are with me at the tip of Ruoriniemi, which offers a view of the dark northern sky.

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Additional information

Aurora brightness
- Bright auroras
Colors with unaided eye and other features
- 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.
- 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..

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Half-sky auroras - 18.9.2023 at 22.30 - 18.9.2023 at 23.30 Lahti Observation number 118803