Why are the different layers of gas on the Sun different temperatures?
That is a very good question, and the answer is no-one knows! There are a lot of theories around as to why the different layers of the solar atmosphere have different temperatures. SOHO is designed to look at the different layers of the solar atmosphere and try to find evidence for the mechanisms that, may heat the solar atmosphere. So in short, we don’t know at present, but we have a lot of theories and a lot of data to help us answer these questions.
