Wednesday at 1930 UTC (3:30 pm ET, 12:30 pm PT) SDO will perform a Delta-H maneuver. This is designed to keep the fine-guidance system within limits by using a series of short burns on the thrusters.
Thursday we will do two more maneuvers. The EVE Field-of-View maneuver will start at 1315 UTC (9:15 am ET) and the HMI/AIA Flatfield at 1630 UTC (12:30 pm ET).
Before, during, and after a maneuver SDO data may be unavailable.