SDO
22nd July 2015, 15:40
SDO will perform a roll maneuver today starting at 1630 UTC (12:30 pm ET). The Sun may appear to rotate in images taken during this maneuver. The roll angle will be removed in the science data.
More... (http://sdoisgo.blogspot.com/2015/07/hmi-roll-maneuver-today.html)
More... (http://sdoisgo.blogspot.com/2015/07/hmi-roll-maneuver-today.html)