At https://www.sciencedaily.com/releases/2024/07/240730134746.htm … we are informed the corona is weirdly hot. The Parker Solar Probe rules out S bends in the Sun’s magnetic field as the cause. This idea had become popular but it seems it is impossible in real life as it is just not happening. The solar corona can be 200 times hotter than the surface of the Sun – below. The Parker Solar Probe has dived into the corona in order to discover the source of its heat. Back to the drawing board I suppose.
At https://phys.org/news/2024-07-solar-corona-hotter-sun-surface.html … The corona, or solar atmosphere, extends 8 million miles above the Sun’s surface – and has extraordinarily high temperatures. In a different study to the one above, Syed Ayaz of the UAH Center for Space Plasma and Research, favours Alfven Waves.