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One EMP burst and the world goes dark

Electromagnetic pulses (EMP) are oversized outbursts of atmospheric electricity. Whether powered by geomagnetic storms or by nuclear blasts, their resultant intense magnetic fields can induce ground currents strong enough to burn out power lines and electrical equipment across state lines.

There is talk of catastrophe ahead, depending on whom you believe, because of the threat of an electromagnetic pulse triggered by either a supersized solar storm or terrorist A-bomb, both capable of disabling the electric grid that powers modern life.

Meanwhile, in Congress, a “Grid Act” bill aimed at the threat awaits Senate action, having passed in the House of Representatives.

Fear is evident. With the sun’s 11-year solar cycle ramping up for its stormy maximum in 2012, and nuclear concerns swirling about Iran and North Korea, a drumbeat of reports and blue-ribbon panels center on electromagnetic pulse scenarios.

Two historic incidents often figure in the discussion:

• On July 9, 1962, the Atomic Energy Commission and the Defense Atomic Support Agency detonated the Starfish Prime, a 1.4-megaton H-bomb test at an altitude of 250 miles, some 900 miles southwest of Hawaii over the Pacific Ocean. The pulse shorted out streetlights in Oahu.

• On March 9, 1989, the sun spat a million-mile-wide blast of high-temperature charged solar gas straight at the Earth. The “coronal mass ejection” struck the planet three days later, triggering a geomagnetic storm that made the northern lights visible in Texas. The storm also induced currents in Quebec’s power grid that knocked out power for 6 million people in Canada and the USA for at least nine hours.

“A lot of the questions are what steps does it make sense to take,” Legge says. “We could effectively gold-plate every component in the system, but the cost would mean that people can’t afford the rates that would result to pay for it.”  - [source]

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