GSN Heliplots, all black, look while they are this way.

http://earthquake.usgs.gov/monitoring/operations/heliplots_gsn.php

All black, something affecting whole planet!

Look through SOHO picks for objects such as comets and such that don't belong!
Look at time / date then look at shoo archive pictures at least 4 hrs earlier in your search.

http://sohowww.nascom.nasa.gov/data/REPROCESSING/Completed/2015/c2/20150726/
Last 3 digits are month and day... modify to suit, same on next, past archive also.
Some things are intentionally left out and may be uploaded at later date so check for missing sequence #'s and write down for easier searches later.

http://sohowww.nascom.nasa.gov/data/REPROCESSING/Completed/2015/c3/20150726/

1 missing picture and some date alignment between c2 and c3.
Which is why I stopped searching these, never a straight answer (nasa)