Hello,
Here is a close-up of the GRS from frames I took on March 3 2007. To improve the clarity of images of selected regions of a planets surface, I developed a slight modification of conventional stacking, which I will call CMS processing, to produce these images. I will provide details of the procedure later.
This pair shows in higher detail the area around the GRS, which I already posted a few days ago as a whole-disk image.
A comparison of the images shows the dark south polar hood present in both visible, and methane-absorption images. The GRS shows a dark area immediately to its south in methane absorption which has no counterpart in visible light. There is a larger slightly brighter region f. the GRS in the methane images which also has no visible counterpart.
The SEBs is darker than the SEBn in methane light. NEB projections are visible in methane absorption but this is probably due to the nonspecific absorption of the 889+/-18 filter. The visible light image of oval A4 has a methane counterpart.
The visible light image of the GRS shows the usual central darkening, as well as a peripheral (edge) darkening. A small dark spot, and a lighter spot lie within the GRS near its p. and northern edges respectively. The Red Spot Hollow is white, unlike the previous few years.
Zac Pujic
Brisbane, Australia
http://astroimg.org
