Figure 3
From: Compound auroral micromorphology: ground-based high-speed imaging
A snapshot of growing eddies is shown at 12:01:15 UT on 21 February 2014 (a). (b) Full-color DSLR all-sky image at 12:01:10 UT shows that the little wavy structure is located at the poleward boundary of an arc system. The formats are the same as Figure 1a,b for sub-figures (a) and (b). Time evolutions of the brightness along the white solid line and dotted line in panel (a) during a 13-s time period from 12:01:07 UT are shown in the panels (c) and (d), respectively.