NASA has selected three proposals for implementation for the Solar Dynamics Observatory (SDO) mission. The SDO is the first in a series of missions in the Living With a Star (LWS) Program. SDO flight instruments will be flown on a NASA-supplied Sun-pointing spacecraft in geosynchronous orbit that NASA intends to launch in August 2007 for a prime mission of five years.
http://www.sciencedaily.com/releases/2002/08/020821070823.htm