Active aurora band - 16.3.2023 at 00.30 - 16.3.2023 at 01.00 Hamina Observation number 113541

Visibility III / V

Heikki Jokiranta

When photographing the northern lights, I noticed very fast , successive waves moving across the sky - difficult to describe - like faint "hail waves" that traveled "from north to south". Impossible to film with a system camera (fx). It wasn't about the dunes, for example. Colorless to the eye. This is the second time I have observed this phenomenon.

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Additional information

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..
- Flaming auroras
  
  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.

Technical information

Iso 800-1600, f2.8-4, 3-8sec.

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Active aurora band - 16.3.2023 at 00.30 - 16.3.2023 at 01.00 Hamina Observation number 113541