Solar Dynamics Observatory (SDO) HMI Images: http://sdo.gsfc.nasa.gov/data/
Solar Dynamics Observatory (SDO) AIA with PFSS Image: http://sdo.gsfc.nasa.gov/data/
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Solar and Terrestrial Relations Observatory (STEREO) Images: http://stereo.gsfc.nasa.gov/
Solar and Heliospheric Observatory (SOHO)  Images: http://sohowww.nascom.nasa.gov/
GOES 15 Solar X-ray Imager (SXI) 
SWPC Images:  http://www.swpc.noaa.gov/products/goes-solar-x-ray-imager-sxi
GOES 14 Solar X-ray Imager (SXI) 
SWPC Images:  http://www.swpc.noaa.gov/products/goes-solar-x-ray-imager-sxi
GOES 13 Solar X-ray Imager (SXI) 
SWPC Images:  http://www.swpc.noaa.gov/products/goes-solar-x-ray-imager-sxi
GOES SXI 12 13 14 15
NOTE

Check Date-Time on SXI Images for the latest operational satellite.