http://www.edinboro.edu/cwis/physics/observ/research.html

Solar Irradiance Variability.

http://nssdc.gsfc.nasa.gov/photo_gallery/photogallery-earth.html

National Space Science Data Center A NASA site with lots of pictures, fact sheets, glossary.

http://argo.tuc.noao.edu/

National Solar Observatory

http://www.hao.ucar.edu/public/slides/slides.html

The High Altitude Observatory an attractive set of images of the Sun showing spots, prominences, and so forth...

http://sundog.caltech.edu/

Big Bear Solar Observatory

http://www.ct.astro.it/

Catania Astrophysical Observatory

http://hao.ucar.edu/

High Altitude Obsevatory

http://umbra.nascom.nasa.gov/sdac.html

Solar Data Analysis Center

http://orpheus.nascom.nasa.gov/serts/

Solar Extreme-ultraviolet Rocket Telescope and Spectrograph

http://hesperia.gsfc.nasa.gov/sftheory/

Solar Flare Theory

http://solar.uleth.ca/solar

Solar Terrestrial Dispatch

http://www.astro.uva.nl/~michielb/sun/

Trip Through The Sun

http://www.ngdc.noaa.gov/stp/GLOSSARY/glossary.html

Glossary of Solar-Terrestrial Terms

http://www.nso.noao.edu/welcome.html

National Solar Observatory Home Page

http://fusedweb.pppl.gov/CPEP/Chart_Pages/5.Plasmas/SunLayers.html

The Sun: From Core To Corona

http://www.ips.gov.au/asfc/current/

Learmonth Solar Observatory,Western Australia

http://www.ct.astro.it/

Catania Astrophysical Observatory – Italy

http://www.solar.ifa.hawaii.edu/

Mees Solar Observatory

http://umbra.nascom.nasa.gov/images/latest.html

Solar Data Analysis Center NASA Goddard

http://sec.noaa.gov/solar_images/ImageIndex.cgi

Space Environment Laboratory

http://www.hawastsoc.org/solar/eng/homepage.htm

Calvin Hamilton's "Views of the Solar System"

http://seds.lpl.arizona.edu/billa/tnp/nineplanets.html

The Nine Planets

http://sohowww.nascom.nasa.gov/

SOHO: The Solar and Heliospheric Observatory