Oh no. Birkeland's solar model predicts that the whole surface is *highly* electrically active. It should be *BRIGHT*, not dark all along the limb. It only goes "dark" right at the "surface" at the limb. The electrical activity along the surface is the light source that makes is "bright" along the surface. Pass!
So the 3D model is (from the outside in)
coronal loops
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bright and electrically-active layer
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"transparent neon-based substance TBD"
ETA "transparent silicon substance TBD"
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ultrahot iron vapor emitting 171A
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solid iron at 2000K
Do I have that right? This is the first time you've mentioned light from the electrical activity so forgive me if my mind-reading skills have put it in the wrong place. Which layer is responsible for the "green" emissions which end up in the famous 20-pixel-wide stripe on the 2D image provided by the SDO PR department? I've asked eight times, explain already.
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