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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Active aurora band - 10.9.2021 at 00.30 - 10.9.2021 at 03.00 Valtimo Observation number 101418

Visibility III / V

The calm storm surprised with its beauty. A series of images of the westward wave of a substorm. The brightest phase in the main image, the other images in chronological order. At the beginning of the substorm, a false start was seen, which can be characterized by the disintegration of the oval into parts and their reunion into a calm diffuse arc before brightening.

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  • Aurora brightness
    • Dim auroras
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