Visibility IV / V
Halo report part 2/2: timelapse from 10.53-16.19
After an active twenty minutes, I left the camera shooting at 10 sec intervals. The unprocessed timelapse (first image, 20fps) has occasional spectacular halos, and the processed version reveals much more (image 2, 10fps).
I made separate stacks of the most interesting points, and corresponding simulations:
Figure 3: (see processed video, at 0:59) Six images, 12:30 p.m., 34.8° + simu as gif
I was surprised when, in the simulation, the Lowitzes did not come across the "X" at the right Saur at all. I tried to simulate alternative Lowitzes and they match perfectly! In Martikainen, I also think the alternative Lows in the quadrilateral view.
Figure 4: (see processed video, at 1:06) Six images, at 12:44, 35.1° + simuja as gif
The bump coming down from the left sauri is perhaps a little better suited as an alternative than a regular Low. There are two ridges above the Sauri, the longer of which would otherwise be suitable as an alternative Low, but curves too steeply towards the ring. The shorter shore does not match any Lowitz. (In the gif, the stack and simulations differ from regular and alternate Lowitz). Pyra's piece? (pyra is not visible elsewhere). No halo at all?
Figure 5: (see processed video, at 1:17) Seven images, at 1:02 p.m., 35.3° + simuja as gif
Above the left Sauri, you could imagine a gentle alternative - Lowit. But the straight edge on the underside is not suitable for standard or alternative Low. Too direct. But is its directness a delusion? Is halo the laziest? On the other hand, Martikainen noticed a similar strangeness in his six-figure image. At the top right, could you chop a piece of alternative Low from behind the foliage?
Figure 6: (see processed video, at 2:45) Six images, at 15:29, 29.6° + simuja as gif
At the end, the bright Sauri and the Lowitzes still flashed. Otherwise, that would match well with the combination of lower & annular, but the latter looks very thick. Alternatives help and thickness is explained by the combination of ring-like and lower alternative.
to be continued in the specifications...