I am not sure what time of day has to do with this.
Dave Noble could be anywhere at anytime of the day or night
I suspect it is actually the pink glow of morning?
And if it is further out than the Gallagher Plateau, I know Dave has done at least 1 trip down the Weld River, and it was probably on an approach to that river that this was taken.
However, I will try and be more specific and suggest the Jubilee Range.
And is this a telephoto shot?
Now to scan through all his photos.... what were you saying tasadam?