Quite a nice read on sun spots. I think you can make some basic arguments about the reduced temperature being from more efficient conversion of energy into heating the Corona rather than the photosphere.
Again a little bit of physics would not have hurt here with an explanation that spectral lines split with magnetic field allowing us to measure the strength of magnetic field with a prism or diffraction grating.
I am a little disappointed at getting fatigued while podcasting.
MP4 recording MP3 recording
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