The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
This image, originally posted to Flickr, was reviewed on 13 May 2016 by the administrator or reviewerJarekt, who confirmed that it was available on Flickr under the stated license on that date.