Figure 1
From: Compound auroral micromorphology: ground-based high-speed imaging
Pulsating aurora appeared to the west, and flickering rays appeared to the northeast. (a) Pulsating aurora appeared to the west, and flickering rays appeared to the northeast in the snapshot at 09:30:02 UT. North is to the top and west is to the right for sub-figures (a) and (b), and the magnetic zenith is at about the center of the image (a). (b) Full-color DSLR all-sky image at 09:30:00 UT shows that the compound structure is located at the middle of a surge. (c) Time evolution along the white line in the panel (a) during a 10-s time period from 09:30:00 UT and (d) the expanded view of the flickering rays are also shown.