Event measures 9 on 0-9 scale, power system, satellite disruptions likely causing possible power outages and satellite disruption, an extreme geomagnetic storm occurred yesterday that registered at the highest level on measurements of such solar activity. Extreme geomagnetic event recorded on sun on Sunday (NOAA photo) Forecasters at the National Oceanic and Atmospheric Association Space Environment Center in Boulder, Colo., observed the event, which measured G-5 – the highest level – on the NOAA Space Weather Scales. "This event registered a 9 on the K-Index, which measures the maximum deviation of the Earth's magnetic field in a given three-hour period,"...