OK, I did not know of those tests but I was not wrong about EMP effects from nuclear blasts, either. There were none of any significance directly below a 1.4 megaton explosion only 250 miles up. Nor were there any significant EMP impacts from any nuclear detonation anywhere. Those tests when interpreted properly say that nuclear EMP effects are trivial and probably confined to mobile devices immediately beneath the blast as I said.
That does not mean that significant EMP effects cannot happen, only that they arise from a cloud of solar plasma shrouding the earth and making a mighty TWANG in the magnetic field of the planet. The CME event is something that we should plan for and harden the infrastructure against - but like the asteroid strike in Yucatan or the megavolcano under Yosemite or the "Big One" earthquake in California, it need not frighten us overmuch - it is a rare event, but if you wait long enough, almost certain to occur.
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Why will it take months to turn the electric back on ?
Re: Why will it take months to turn the electric back on ?
by KaiserJeep » Thu 03 Dec 2015, 14:28:26
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Warning: Messages timestamped before April 1, 2016, 06:00 PST were posted by the unmodified human KaiserJeep 1.0
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Re: Why will it take months to turn the electric back on ?
by Pops » Thu 03 Dec 2015, 14:49:20
Did a quick google on
tinker afb emp hardening
(I once heard Tinker AFB had a program)
and got this
http://www.gurevich-publications.com/co ... l_91_2.pdf
which says this
$this->bbcode_second_pass_quote('', 'I')ntroduction. This ETL provides guidance for planning, programming,
designing, constructing, in-progress testing and acceptance testing of
electromagnetic barriers in facilities to limit the magnitude of HEMP-induced
electrical stresses (currents and voltages) that might reach mission-critical
electronic systems and components. The radioactive atmosphere produced by a
high altitude nuclear burst is a result of the interaction of radiation
(chiefly gamma rays) with the atmosphere at altitudes above 30 kilometers.
The radioactive atmosphere then propagates, with little attenuation, to all
points within line-of-sight of the burst. The high altitude burst can
produce high amplitude HEMP electric and magnetic fields. These fields will
create voltages along overhead transmission lines rising to a peak value of
about 50 kilovolts per meter within a few nanoseconds and then decaying
gradually over a period lasting hundreds of seconds.
tinker afb emp hardening
(I once heard Tinker AFB had a program)
and got this
http://www.gurevich-publications.com/co ... l_91_2.pdf
which says this
$this->bbcode_second_pass_quote('', 'I')ntroduction. This ETL provides guidance for planning, programming,
designing, constructing, in-progress testing and acceptance testing of
electromagnetic barriers in facilities to limit the magnitude of HEMP-induced
electrical stresses (currents and voltages) that might reach mission-critical
electronic systems and components. The radioactive atmosphere produced by a
high altitude nuclear burst is a result of the interaction of radiation
(chiefly gamma rays) with the atmosphere at altitudes above 30 kilometers.
The radioactive atmosphere then propagates, with little attenuation, to all
points within line-of-sight of the burst. The high altitude burst can
produce high amplitude HEMP electric and magnetic fields. These fields will
create voltages along overhead transmission lines rising to a peak value of
about 50 kilovolts per meter within a few nanoseconds and then decaying
gradually over a period lasting hundreds of seconds.
Here is this from October
http://www.militaryaerospace.com/articl ... radar.html
$this->bbcode_second_pass_quote('', 'A')ir Force asks Exelis to EMP-harden long-range ballistic missile warning radar systems
October 8, 2015
By John Keller
Editor
EMPPETERSON AIR FORCE BASE, Colo., 8 Oct. 2015. Radar experts at Exelis Inc. in Colorado Springs, Colo., will harden U.S. ballistic missile defense radar systems against the effects of electromagnetic pulse (EMP) under terms of a $12.4 million contract modification announced last week.
Don't know how authoritative this is
http://www.futurescience.com/emp/EMP-myths.html
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-- Abraham Lincoln, Fragment on Government (July 1, 1854)
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Re: Why will it take months to turn the electric back on ?
by Lore » Thu 03 Dec 2015, 16:27:14
You have more to worry about and a better likelihood for loss of electricity though a major pandemic. Key players gone and a loss of knowledge with people initially not reporting to work can quickly put many wide areas out of business.
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Re: Why will it take months to turn the electric back on ?
by vox_mundi » Thu 03 Dec 2015, 16:32:09
$this->bbcode_second_pass_quote('KaiserJeep', '.').. I was not wrong about EMP effects from nuclear blasts, either. There were none of any significance directly below a 1.4 megaton explosion only 250 miles up. (... that's because it was done over the Pacific Ocean) Nor were there any significant EMP impacts from any nuclear detonation anywhere.
Incorrect:$this->bbcode_second_pass_quote('', '[')img]http://i.crackedcdn.com/phpimages/article/2/0/5/102205_v1.jpg[/img]
That warm, patriotic feeling is actually your organs slowly cooking
Effects of Starfish Prime: The detonation released an enormous electromagnetic pulse that knocked out power in Hawaii 870 miles away and wrecked one-third of all the satellites orbiting the earth at that time. Basically, unless a satellite was hiding behind the earth, it was rendered useless.
The strength of the pulse was so huge that it affected the flow of electricity on the Earth hundreds of kilometers away! In Hawaii it blew out hundreds of streetlights, and caused widespread telephone outages. Other effects included electrical surges on airplanes and radio blackouts.
And there was another effect that hadn’t been predicted accurately. Many of the electrons from the blast didn’t fall down into the Earth’s atmosphere, but instead lingered in space for months, trapped by Earth’s magnetic field, creating an artificial radiation belt high above our planet’s surface.
When a high-speed electron hits a satellite, it can generate a sort-of miniature EMP. The details are complex, but the net effect is that these electrons can zap satellites and damage their electronics. The pulse of electrons from the Starfish Prime detonation damaged at least six satellites (including one Soviet bird), all of which eventually failed due to the blast. Other satellite failures at the time may be linked to the explosion as well. link
In 2010, the Defense Threat Reduction Agency issued a report called "Collateral Damage to Satellites from an EMP Attack"
Video of Starfish Prime and Fishbowl tests
$this->bbcode_second_pass_quote('', ' ')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.
The pulse can easily span continent-sized areas
The EMP produced by the Compton electrons typically lasts for about 1 microsecond, and this signal is called HEMP. In addition to the prompt EMP, scattered gammas and inelastic gammas produced by weapon neutrons produce an "intermediate time" signal from about 1 microsecond to 1 second. The energetic debris entering the ionosphere produces ionization and heating of the E-region. In turn, this causes the geomagnetic field to "heave," producing a "late-time" magnetohydrodynamic (MHD) EMP generally called a heave signal. link
$this->bbcode_second_pass_quote('KaiserJeep', '.').. nuclear EMP effects are trivial and probably confined to mobile devices immediately beneath the blast as I said.
$this->bbcode_second_pass_quote('', '.').. systems connected to long lines (e.g., power lines, telephone wires, and tracking wire antennas) are at risk because of the large size of the induced current. The additive effects of the MHD-EMP can cause damage to unprotected civilian and military systems that depend on or use long-line cables. Small, isolated, systems tend to be unaffected. link
Some other links to cyber effects on critical infrastructure ...
NSA Director Fears “Destructive” Element in Coming Cyberattacks
$this->bbcode_second_pass_quote('', 'G')en. Alexander said two cases illustrate what could happen in an attack.
The first was the August 2003 electrical power outage in the Northeast U.S. that was caused by a tree damaging two high-voltage power lines. Electrical power-grid software that controlled the distribution of electricity to millions of people improperly entered “pause” mode and shut down all power through several states.
The example highlighted the threat of sophisticated cyberwarfare attackers breaking into electrical grid networks and using the access to shut down power.
The second example was the catastrophic destruction of a water-driven electrical generator at Russia’s Sayano-Shushenskaya dam, near the far eastern city of Cheremushki, in August 2009.
Gen. Alexander said one of the dam’s 10 650-megawatt hydroturbine generators, weighing more than 1,000 tons, was being serviced and, by mistake, was remotely restarted by a computer operator 500 miles away. The generator began spinning and rose 50 feet into the air before exploding. The flood caused by the accident killed 75 people and destroyed eight of the remaining nine turbines.
