Daniel, Thanks for confirming my thinking this was a shock (also indicated by SOHO/MTOF) in a highly turbulent flow. I suggest, if correct, that it was the shock described in our FF#521 from the M1.6/SF flare on 11 November at S03W61. This is the case described by Gareth Lawrence the next day as spawning a 'full' halo CME associated with this flare. Meanwhile, let's see if AR0501 has any sparks left after its previous life during the "Halloween Epoch '03" as AR0484! Regards, Murray