This site from the Goddard Space Flight Center presents hourly "'Near-Earth' solar wind magnetic field and plasma data, energetic proton fluxes (>1 to >60 MeV), and geomagnetic and solar activity indices." In addition...

The Sun appears to shine at a constant rate. However, its magnetic field is actually constantly changing, and this affects energy output. These variations cause effects that extend throughout the solar system. This video...

This set of web pages, authored and curated by David P. Stern, provide an elementary introduction to the solar wind, starting with evidence from comet tails and continuing to Parker's theory of the Sun's corona and...

This site discusses the sun. Some of the topics that are touched on include: the sun's interior, the surface/atmosphere, solar activity, the fate of the sun, solar eclipses, and the myth/culture of this celestial body....