jpeg pixel mapping artifact... ive had weird shit like this in photos ive taken at night....the single dead pixel is ''white hot''....so when compressed as a jpeg, a few around it, but not all, get mapped as white too..so you get that pattern. the line is probably also some sort of compression artifact....its gets ''whiter'' towards the dead pixel, and blends back to the purple from the suns corona the further away from the pixel. also, dont you find it strange that something in the suns corona would reflect only pure white light? if there was an object actually there, you would expect atleast some tone from the surrounding colours.
Canada