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GEOMAGNETIC STORM WATCH: A series of coronal mass ejections (CMEs) propelled toward Earth by the recent eruptions of sunspot 1283 will deliver glancing blows to Earth's magnetic field on Sept. 9th - 11th. High-latitude sky watchers should be alert for auroras in the nights ahead.
In a press release Thursday night, the Arizona Public Service said one of its employees was carrying out a procedure at a substation northeast of Yuma that caused the problem. The utility said the resulting power failure should have been isolated to the Yuma area. An investigation into why it was not is under way, the utility said.
That problem caused the two reactors at the San Onofre nuclear power plant on the coast north of San Diego to go offline at 3:38 p.m. Charles Coleman, a spokesman from Southern California Edison, said the reactors are programmed to do that when there is a disturbance in the power grid, and there was no danger to the public or to workers there.