Active aurora band - 30.3.2021 at 22.58 - 30.3.2021 at 23.04 Kolari, Ylläsjärvi Observation number 97228

Visibility III / V

Yrjö Benson, Ursa (Helsinki)

The images on the left show a red-purple arc or radius straight up from the western horizon. At first it was only visible on the camera but when I looked away. so I saw it dimly even with the naked eye. Some people estimate that there could be a SAR. But it may not, however, because it is to some extent related to the main formation of the northern lights and is not very uniform in shape. There was a lot of red and lilac in the sky above the greenish Northern Lights, up to about 50 degrees in the northwest sky.

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Additional information

Aurora brightness
- Bright auroras
Observed aurora forms
- STEVE-arc
  
  STEVE (Strong Thermal Emission Velocity Enhancement), Pink, radial aurora-like arc . The STEVE arc is seen clearly separated from the main aurora arc of the northern sky. It forms a long and narrow west-east aligned, usually dim form. It does not belong to traditional auroras as a phenomenon, but may appear same time with them. Occasionally there may also be a green, "toothed" band called ”picket fence” at the bottom of Steve.
  
  Photo by: Riku Talvio

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Active aurora band - 30.3.2021 at 22.58 - 30.3.2021 at 23.04 Kolari, Ylläsjärvi Observation number 97228