I had actually looked to see what was going on with solar missions with NASA and ESA, yet in my searching I had not found anything that appeared to be replacing SOHO, but then stuff on SDO has been popping up in the media lately, so maybe I missed it. Today I found the main data page for SDO. Wow. Here is a list of instruments on the craft. Unlike the SOHO which is in what is called a Lagrange halo orbit, SDO is in an inclined geosynchronous Earth orbit (GEO). At least part of the reason for this, I have read, may have to do with data transfer rates, as SDO is transmitting much more information than SOHO. Its actually interesting to know what the Sun-Earth Lagrange points are, and why the L(1) was chosen for SOHO.
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