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YourAdministrator, eh?
8,000 Posts
Thanks for the heads up ... too bad that I don't have a T.V. either.

From the National Geographic website:

Back in 1991, edgy German director Wim Wenders made a movie, "Until the End of the World." There's a subplot - one of many in the complicated flick - in which people on Earth are menaced by an out-of-control satellite that is threatening to fall from orbit. In the end, the failing satellite instead is shot down. The resulting massive, high-altitude nuclear explosion, however, fries unshielded satellites, communications networks, phones and computers all over the planet, instantly forcing our gadget-obsessed species to go electronic cold turkey.

Sound far-fetched? Think again. Wenders' plot twist was based, albeit loosely, on the actual concept of electromagnetic pulse (EMP) weaponry.
As an article from the Federation of American Scientists web site explains:

A high-altitude nuclear detonation produces an immediate flux of gamma rays from the nuclear reactions within the device. These photons in turn produce high energy free electrons by Compton scattering at altitudes between (roughly) 20 and 40 km. These electrons are then trapped in the Earth's magnetic field, giving rise to an oscillating electric current. This current is asymmetric in general and gives rise to a rapidly rising radiated electromagnetic field called an electromagnetic pulse (EMP). Because the electrons are trapped essentially simultaneously, a very large electromagnetic source radiates coherently.

In theory, such an artificially-induced magnetic storm could wreak the sort of havoc that Wenders depicted in his film, at least over a wide swath of the planet. As the Comprehensive Test Ban Treaty Organization web site notes,

The intense electric and magnetic fields can damage unprotected electrical and electronic equipment over a large area. It is now thought that a single high-altitude blast over the United States could seriously disrupt the nation's communications system, and perhaps shut down the entire power grid. At present, however, there is no known way of providing complete protection against the effect.

The first scientist to predict the potentially disruptive electromagnetic effects of a nuclear bomb blast was physicist Enrico Fermi, who was one of the leaders of the Manhattan Project, the U.S. effort to create the first atomic bomb during World War II. British scientists who conducted nuclear tests in the early 1950s noticed that they disrupted electronic equipment, a phenomenon that they called "radio flash." According to this 1964 paper on the effects of EMP by NASA scientist Wilmot N. Hess, with the advent of space rocketry in the late 1950s, both the U.S. and the Soviet Union began experimenting with exploding nuclear devices hundreds of miles above the Earth's surface to create artificial magnetic fields. Hess writes that at least seven such tests were conducted. The largest was the Pentagon's July 9, 1962 Starfish Prime test, in which a 1.4 megaton thermonuclear device was launched on a Thor rocket to about 680 miles above the Earth. On the way down, the bomb was detonated about 250 miles above Johnson Island in the south Pacific.

Starfish was what alerted military scientists to the potential of EMP weapons. The blast produced an electromagnetic pulse that was so much bigger than expected that it threw instruments out of whack, making it difficult to get accurate measurements. In Hawaii, 900 miles away, telephone service was disrupted, burglar alarms went off, and most bizarrely, 300 streetlights went dark in Honolulu, according to a 1989 report on the event from Sandia National Laboratories.

But high above the Earth, Starfish demonstrated even greater potential for havoc. In a bizarre planning snafu, Telstar, the first satellite designed to relay television broadcasts, had been scheduled for launch the day after the Starfish test. As Bell Laboratories electrical engineer James Early described in this 1990 article, the bomb blast

…gave rise to enormous numbers of high energy electrons and ions, a substantial fraction of which went into the van Allen belts. These swamped completely the normal van Allen belt populations, and caused noticeable radiation damage. Loss of control of the satellite repeater occurred first in August. Painstaking and brilliant analysis by the circuit and system engineers identified the specific point of failure and provided revised commands which effectively bypassed the failed circuit, thus restoring control and usefulness of the satellite until continuing radiation damage caused final failure a few weeks later.

The effects of Starfish, however, were puny compared to the havoc wreaked by Test 184, a Soviet nuclear test conducted on October 22, 1962, at the height of the Cuban Missile Crisis showdown between the U.S. and U.S.S.R. The Kremlin cold-bloodedly decided to test the effects of an EMP on a heavily populated, developed area in Kazakhstan. As this article by Jerry Emanuelson details, the 300-kiloton blast 180 miles over the region knocked out a 600-mile long underground power line running from Astana to Almaty, and ignited another fire in a power plant in the city of Karagandy by frying a shielded, buried electrical cable. According to Emanuelson, the E3, a component phase of the pulse, was more than twice as intense as that from a solar flare that crashed the entire Quebec electrical grid in 90 seconds in 1989.

Most people didn't hear about any of this until the early 1980s, when the again-escalating arms race between the U.S. and Soviets stimulated a slew of newspaper articles and TV shows warning about the various potential horrors of a nuclear confrontation. While acknowledging that an EMP attack wouldn't kill millions of people and obliterate cities like a straightforward nuclear missile attack, prophets of doom envisioned that it might leave us helpless to combat invading Soviet soldiers, creating a horrific scenario similar to the 1984 John Milius movie thriller "Red Dawn". Nuclear scientist Edward Teller warned in a 1983 New York Times article that

Civilians should remember that their electronic watches might be destroyed, television sets might become inoperable, cars with electronic ignition might stop functioning, and almost every big industry with electronic components would be affected.

But even after the fall of the Soviet Union caused fears of a superpower confrontation to give way to the more diffuse fear of terrorists and small rogue nuclear nations such as North Korea, fears of a paralyzing EMP attack continued to haunt defense planners. In a 2004 report, a commission of experts assessed the threat of an EMP attack to the U.S., and sketched out a scary picture of how today's U.S., which is far more dependent upon electronic gadgetry than it was decades ago, would be affected.

Depending on the specific characteristics of the attacks, unprecedented cascading failures of our major infrastructures could result. In that event, a regional or national recovery would be long and difficult and would seriously degrade the safety and overall viability of our Nation. The primary avenues for catastrophic damage to the Nation are through our electric power infrastructure and thence into our telecommunications, energy, and other infrastructures. These, in turn, can seriously impact other important aspects of our Nation's life, including the financial system; means of getting food, water, and medical care to the citizenry; trade; and production of goods and services. The recovery of any one of the key national infrastructures is dependent on the recovery of others. The longer the outage, the more problematic and uncertain the recovery will be. It is possible for the functional outages to become mutually reinforcing until at some point the degradation of infrastructure could have irreversible effects on the country's ability to support its population.

Frightening, huh? The report also suggested that other countries may have battle plans in place to use EMP against the U.S., should they ever come into conflict with us.

Indeed, as recently as May 1999, during the NATO bombing of the former Yugoslavia, high-ranking members of the Russian Duma, meeting with a US congressional delegation to discuss the Balkans conflict, raised the specter of a Russian EMP attack that would paralyze the United States.

The report also suggested possible measures for protecting the U.S. against an EMP effect, or at least reducing its potential impact. U.S. power grids and computer networks, for example, could be decentralized to prevent cascading breakdowns, and plans could be laid to quickly repair systems and get them back online in the event of an attack. But none of that sounds very reassuring. That may be one reason why the U.S. is pressing ahead with something that may serve as an effective deterrent - missiles and/or drone aircraft that would use microwaves instead of nuclear bombs to create devastating EMP surges, a lot more quickly and efficiently.

Explorer's "Electronic Armageddon" airs Tuesday, June 15 at 10P et/pt.
Read more: Explorer Blog - National Geographic Channel

I sold my soul to The_Blob. He had candy...
1,799 Posts
This show re-airs Saturday at 7 pm (eastern) for those of us that missed it the first time!!

Family Friendly DJ
101 Posts
From the National Geographic website:

Civilians should remember that their electronic watches might be destroyed, television sets might become inoperable, cars with electronic ignition might stop functioning, and almost every big industry with electronic components would be affected.
Short version of below ramble:

You've got bigger things to worry about.

Long Version:

In the kinds of kv that would cause this, your wristwatch ceasing to function would be the least of your worries. Devices are fairly well shielded against these sorts of things mostly by accident alone. (you might blow out old capacitors, but that's about it) You WOULD likely have to power down the device if it was on though, or else it wouldn't work well. This is not to say EMP phenomenon is false or anything Nat'l Geographic says is incorrect, it is to say they're leaving something out. Mostly you'll blow out power transformers and poorly ground power wires. A few hours with regular work crews re-wrapping copper wires and we'd be back on line. It's not really that huge a threat.

Sorry, I got off topic... at the power levels required to (entirely) blow out small electronics? You've got far bigger problems to worry abut. Odds are your your brain's synapses would be all fried due to the sodium inside being ionized. This could have many unforseen side effects like coma, mental retardation.. amnesia, blah blah blah.. or it might just make you feel uneasy for a while. The effects are varied, and a bigger problem than consumer electronics going kerploof.. I assure you it would drive some people looney. However... in order to cause THIS (the skull is an excellent insulator) you'd first have yet another problem...

All the sodium in your system would be ionized. This would have extremely ugly effects on your circulatory system. This will not kill you, that is correct: but it's going to make you extremely ill quickly. Really it's a fun story gimmick, but the effects are mostly "what was that?" followed by "dispatch work crews to fix that!"
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