For anyone who is really interested in Birkeland's (not mine) solar model, this two minute video is an *excellent* introduction to Birkeland's cathode solar model.
This two minute video explains all the basic concepts, including the heat source of the corona (current flow from the cathode surface) and the "cause" of planetary aurora which we find around *many* planets in our solar system.
The constant particle flow from the sun is a form of kinetic energy, and it tends to heat up the "atmosphere" of both the sun and the Earth's aurora. That constant flow of current is the heat source of the upper atmosphere of the sun which is how and why the outside layers can be hotter than the inside ones. The surface of the sphere itself can be *much* cooler than the hot thin plasma which is surrounding the sphere.
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