If I'm to understand this fully, your theory is that a heat zone extends from the Sun, represented by ambient, not radiant, heat, which you consider the "real" thermosphere. Another extends from the Earth, created by the internal heat of the Earth's core.
I gather that your point is that the higher a spacecraft is, the hotter it should be, because it's closer to the Sun? And that you think Apollo 13 reporting it was getting cold is wrong, because it should have been warmed by the Sun?