The line had been hovering around just above zero (black line) for several days, but the terrorist attacks on the World Trade Center in New York produced a particularly violent swing. The fact that the diodes reacted together all around the world BEFORE the pictures of the attack reached our screens indicates that we are all interconnected even if we are not seeing the same pictures or getting the same information.
As in this case, the nearness to the place of the event hardly plays any role for the diodes; the diodes in distant Asia, Africa or Europe reacted the same as those placed near New York. The morphic field theory may possibly serve as an explanation here . . .