If you pay close attention to the west limb during these movies courtesy of the Solar Dynamics Observatory (SDO), you will notice a shockwave originating from the farside of the sun beyond the west limb beginning around 08:00 UTC Tuesday morning (March 24, 2015). An impressive coronal mass ejection (CME) was associated with this event.
Additional video courtesy of LASCO C2 and C3 captures the fast moving plasma cloud leaving the sun. Although the source of this eruption is not technically known because of the STEREO Ahead shutdown, we can report that apart from a minor increase in low energy proton levels, no major impact to our planet is expected.