NASA is cooperating in international efforts to study the Sun more intensely than ever before through Solar Maximum...

http://sohowww.nascom.nasa.gov/
SOHO Home Page

http://www-istp.gsfc.nasa.gov/istp/polar/
Polar Spacecraft Hoem Page

http://www.srl.caltech.edu/ACE/
Advanced Composition Explorer (ACE) Home Page

http://www-istp.gsfc.nasa.gov/
International Solar Terrestrial Physics Home Page