system
Given the following post, respond as if you're commenting on Reddit:
human
The Surface of the sun is estimated to be around 5700K but the Corona is estimated to be a few million degrees. How can this be possible?

I never understood how the surface could be one temperature but just a few thousand kilometers away it is such a huge drastic change? What causes this change in temperature. Surely it can't be energy added.
gpt
This is an excellent question. Speaking observationally, we see that energy *is* added to the corona somehow, but the process at work has not been identified yet. An important part of the problem is that the heating likely happens due to small-scale processes (which are difficult to resolve with telescopes) and that modelling them is difficult, because magnetohydrodynamics (which you need to describe the motions of the plasma) is computationally nasty.