8) Seeing shadows of the festoons on the edge of an EQ Band on Jupiter
You're kidding, right?
Nope. On the same night as mentioned, the gray-green festoons hung out above the ocher-colored EB and were lined with dark edges only on one side. I finally realized that that was because the shadows of the festoons were cast on the clouds below, making the edges of the festoons black on one side. Each festoon looked not just like the typical swirl or arc, but a mottled bunch of cloud, sort of like the center of M42.
It was an uncanny night. I never saw that before and haven't seen it since. Could be I was seeing a darkish chemical in the atmosphere on the downwind side of each festoon instead of a shadow, but the white storms in the depths of the ocher EB did not show that, and some of them were being torn apart and appeared streaked in the downwind direction.
I have to take a little issue with the idea of a cloud "shadow". There are small linear bluish/dark grey clouds or features that hug the main belts and festoons, but these are thought to be either "clearings" in the upper cloud deck or actual bluish clouds rather than shadows. With Jupiter, any shadows cast by higher clouds would tend to fall almost directly beneath them when near disk center, so from Earth, they would be difficult to impossible to see since the sun is always behind us when viewing Jupiter. Clear skies to you.
Well, Jupiter was near quadrature, the festoons were obviously "hanging out over the edge" of the EB, which, from reading about it, is a lower cloud bank we see through the "parting" of the whitish higher-altitude cloud banks. The dark shadow was on the edge away from the sun but not on the sunward edge. And the dark edge of each festoon was thicker near the band it extended from and thinner as you went toward the 'tip". I called them festoons, but I think the correct Jupiter term is "projections".
They appear like bluish-green-grey "hooks" that extend out from a bright band into the ocher-colored EBs.
On this night, those "hooks" appeared mottled and a little flocculent and each one of them had a dark edge to one side, the side away from the sun. Like I said, it could be chemical in nature, and it might even be an illusion caused by color differences, but it sure looked like shadows.