[qimg]http://www.thesurfaceofthesun.com/images/sdo/sd01.jpg[/qimg]
Limb "darkening" in this image is the really "opaque" (GM definition region where it becomes really dark under the chromosphere about 4800KM.
That's an image of limb brightening. The green band is brighter than the black area centerwards of it. Like you expect for an optically-thin corona layer. What do you think is "limb darkening" in this image?
ETA: Stretching my imagination, I have a few guesses. Maybe Michael really thinks that this is a cross-section photo, like a photo of a slice of an orange. He thinks the iron is "black" and the neon is "green" for some reason. Maybe he thinks that the black area represents stuff that's emitting 171A---as though it was a photo negative? Astronomers do that sometimes, but this isn't such a negative. Maybe he thinks that the Fe dissolves in the Ne and so all the 171A light comes from the Ne bulk volume? Maybe he's picturing it as though it's back-lit, and the backlight shines through the Ne but is blocked by the Fe? Either way, he's utterly up the wrong tree.
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