NOAA
Noaa: National Weather Service: The Sun and Its Effect on the Earth [Pdf]
The Space Environment Center (SEC) put together a slide show for use by teachers on Space weather. Begin with discussing solar emission and the sun itself. Then end with a summary of climatic effects of space weather, and a note on space...
University Corporation for Atmospheric Research
Ucar: "Parts" of the Sun
Learn about the sun's three main regions: the Sun's interior, the solar atmosphere, and the visible "surface" of the Sun.