Spacecraft and telescopes use special filters to study our star, revealing new phenomena.
http://www.lmsal.com/YPOP/Classroom/Lessons/Filters/
http://sohowww.nascom.nasa.gov/data/latestimages.html
Latest Solar Images: the most current images from SOHO.
http://www.lmsal.com/YPOP/ProjectionRoom/latest.html
Yohkoh Public Outreach: the latest image of the Sun, taken from the Soft
X-ray Telescope on board Yohkoh.