An aurora near Kiruna in Swedish Lapland. The solar wind particles, very energetic, reached the lower layers of the atmosphere: the bottom part of the aurora was rosy (due to a combination of red - ionized nitrogen - and blue - nitrogen -). This color was perfectly visible to the naked eye.
Canon EOS 6D Astrodon modded, Samyang 24 mm F1.4 @ F2.2, ISO 3200. Individual exposure time: 3.2 seconds. Panoramic of 8 images.