EMP protection

Hmmm.

What you do is compute the local electric field component of the EMP burst.

Then you examine the object, taking into account screening and the conductive circuitry as antennas (or effective antenna apertures).

You then compute the likely coupling, both direct and induced. This gives you the instantaneous voltage induced by the EMP at various locations in the circuit.

Usually, since the induced voltage doesn't persist too long, you just worry about p-n junctions in electronic devices. When the instantaneous induced voltage is too high, it punches holes in these junctions, ruining the electronic devices.

A good, strong EMP ... say induced by a high altitude nuclear burst ... can produce strong enough fields over long enough periods of time to do more than simply blow through silicon chips. But that's what we mostly worry about.

Perhaps that helps. A bit.
 
Someone has read One Second After.

Prep as you would for any normal disaster. If the EMP blast is as bad as it's predicted in that book there is going to be a whole lot of other issues - mostly caused by other people.
 
OldPhysics said:
Hmmm.

What you do is compute the local electric field component of the EMP burst.

Then you examine the object, taking into account screening and the conductive circuitry as antennas (or effective antenna apertures).

You then compute the likely coupling, both direct and induced. This gives you the instantaneous voltage induced by the EMP at various locations in the circuit.

Usually, since the induced voltage doesn't persist too long, you just worry about p-n junctions in electronic devices. When the instantaneous induced voltage is too high, it punches holes in these junctions, ruining the electronic devices.

A good, strong EMP ... say induced by a high altitude nuclear burst ... can produce strong enough fields over long enough periods of time to do more than simply blow through silicon chips. But that's what we mostly worry about.

Perhaps that helps. A bit.
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Should such a thing occur, our DVD players and televisions will be the least of our problems. For quite awhile, in fact.
 
Halfneck said:
Someone has read One Second After.

Prep as you would for any normal disaster. If the EMP blast is as bad as it's predicted in that book there is going to be a whole lot of other issues - mostly caused by other people.
Click to expand...

Actually, I haven't read it yet. I do have a reservation at the library, though.
 
If you like EMP apocalypse fiction, there is a free pdf book called Lights Out. It isn't the greatest writing, but it was cheap entertainment.
 
dawsonbob said:
brian321 asked if the date was September 21st, 2012. I said I would see if I could find a url for one of the articles. Here it is http://www.newscientist.com/article...rt-90-seconds-from-catastrophe.html?full=true

By the way, Brian, you only missed it by one day (I don't think they're that accurate, anyway).:D
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Yea i was thinking of the night of the 21st, But it really would be at midnight(22nd). Thats when the planets are supposed to align for the first time in 25,000 years(i think:confused:) Also the first time in human history. You never know whats gonna happen:eek:
 
The planets will not be aligned on 12/21/2012, that's a myth
Nasa has a neat solar system simulator, you can put in the date and time, and see the position of the planets, moons, spacecraft, or the whole solar system.
http://space.jpl.nasa.gov/


The Earth/Sun will be lined up with the center of the galaxy, but that's happened twice a year for a week or so at a time for over a decade, and for almost a decade after 2012 IIRC.
 
Calebklyne said:
there are a lot of scientist who say a lot of things but rarely do they ever have proof or fact to support their theories
Click to expand...

But in this case they do....
At 11:18 AM on the cloudless morning of Thursday, September 1, 1859, 33-year-old Richard Carrington—widely acknowledged to be one of England's foremost solar astronomers—was in his well-appointed private observatory. Just as usual on every sunny day, his telescope was projecting an 11-inch-wide image of the sun on a screen, and Carrington skillfully drew the sunspots he saw.

On that morning, he was capturing the likeness of an enormous group of sunspots. Suddenly, before his eyes, two brilliant beads of blinding white light appeared over the sunspots, intensified rapidly, and became kidney-shaped. Realizing that he was witnessing something unprecedented and "being somewhat flurried by the surprise," Carrington later wrote, "I hastily ran to call someone to witness the exhibition with me. On returning within 60 seconds, I was mortified to find that it was already much changed and enfeebled." He and his witness watched the white spots contract to mere pinpoints and disappear.

It was 11:23 AM. Only five minutes had passed.

Just before dawn the next day, skies all over planet Earth erupted in red, green, and purple auroras so brilliant that newspapers could be read as easily as in daylight. Indeed, stunning auroras pulsated even at near tropical latitudes over Cuba, the Bahamas, Jamaica, El Salvador, and Hawaii.

Even more disconcerting, telegraph systems worldwide went haywire. Spark discharges shocked telegraph operators and set the telegraph paper on fire. Even when telegraphers disconnected the batteries powering the lines, aurora-induced electric currents in the wires still allowed messages to be transmitted.

A similar flare on March 13, 1989, provoked geomagnetic storms that disrupted electric power transmission from the Hydro Québec generating station in Canada, blacking out most of the province and plunging 6 million people into darkness for 9 hours; aurora-induced power surges even melted power transformers in New Jersey.
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http://science.nasa.gov/headlines/y2008/06may_carringtonflare.htm?

The largest flare ever recorded (since there was no way to measure the Carrington one) occurred in Nov 2003. It was twice as large as any recorded before it but fortunately it wasn't directed towards the earth so we didn't receive much of an impact from it.
On 4 November 2003, the largest solar flare ever recorded exploded from the Sun's surface, sending an intense burst of radiation streaming towards the Earth. Before the storm peaked, x-rays overloaded the detectors on the Geostationary Operational Environmental Satellites (GOES), forcing scientists to estimate the flare's size.

"This makes it more than twice as large as any previously recorded flare, and if the accompanying particle and magnetic storm had been aimed at the Earth, the damage to some satellites and electrical networks could have been considerable," says Thomson.
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http://www.spaceref.com/news/viewpr.html?pid=13844

Certainly the odds aren't high of it happening but it's still a possibility.
 
BlackHills said:
But in this case they do....

http://science.nasa.gov/headlines/y2008/06may_carringtonflare.htm?

The largest flare ever recorded (since there was no way to measure the Carrington one) occurred in Nov 2003. It was twice as large as any recorded before it but fortunately it wasn't directed towards the earth so we didn't receive much of an impact from it.

http://www.spaceref.com/news/viewpr.html?pid=13844

Certainly the odds aren't high of it happening but it's still a possibility.
Click to expand...

This is really good information, and emphasizes the fact that it doesn't take a nuclear detonation to cause an EMP. Mother Nature's pretty capable all by herself.

Scary, isn't it?

Now we'll have a rash of people saying "Yeah, but it can't happen here." Well, yes it can.
 
NOAA gives three day space weather reports and forecasts here with info from the GOES system. So you can see the sun in near real time.

http://www.swpc.noaa.gov/today.html


In my opinion, the most real danger of an EMP event from a MCE is a cascade of our power grids. A catastrophic cascade event would take quite a while to repair. That doesn't just effect electricity for household and industrial use, but processin, refridgeration, distribution and transportation of foods and other critical materials.

http://science.nasa.gov/headlines/y2009/21jan_severespaceweather.htm

It is easy to say that the loss of home computers wouldn't be a catastrophy, but you would be amazed to learn how much of our infrastructure is controlled by computers. Most trucks and all trains, most ocean going vessels rely on GPS and routing computers. I've often heard it said that North America has but three days of foodstuffs on theshelves at any given time. If you've even been in the path of a huricane you know how quickly the stores will empty and how long it will take to restock them. Truth is, we've become comfortable with and dependant upon a computerized JIT food distribution system. Luckily, in hurricane and other localized power outage events, only the food in local stock is sold out or thrown away (many tons of food were condemned and hauled away from our stores after hurricane power outages).
 
There is a scientist who recently did a study on man made emp issues, as opposed to natural. He concluded that the threat from naturally occurring electro magnetic events was more likely though still somewhat remote. His solution was that the United States should invest in hardening its infrastructure, manufacturing and storing transformers in safe locations so that any damaged or affected parts of the electrical grid could be quickly and easily restored or repaired. His supported work concluded that this was prudent, and would also deter any theoretical weapon capability.
 
Or get a giant ammo can and make a faraday cage........

entering-conex.jpg
 
old physics is good example of greatness of the forum. we have experts on all subjects. foot travel & candles will probably be best direction.incidently areas south of san antone are fallout free due to prevailing winds. however not much water in that direction. 20th century aniexty is hell is'nt it.
 
If any other country were to attack the United, "by force", States, the EMP attack would be their only chance at success.
They keep messing with trying to bully Russia and China and nothing would surprise me.
I gotta go grease my windmill.;):cool:
 
Given what is going on all over the world, I don't think we will have to wait for long to find out what EMP can do.
 
Black Hills nailed it nicely. A Carrington event is what worries me. They have evidence of it in GLACIERS, as it ionized a lot of particles that subsequently made their way to the ice and were frozen in time.

The real danger, IMO, is power transmission. Current estimates to replace the transformers in our infrastructure are 1.5 - 2 years. Years. There are very few spares. So if one knocks those babies out, think of doing without the following for 2 years - power, food, fuel, medicine, refridgeration, transportation. All of that depends on the grid.

It's great to be prepared, but if one of these hits, self sufficiency for a very long time will be important.
 
On December 22nd, 2012 I'm going to walk into work and whine about there not being a SHTF situation. I'll then drink my coffee and start my day. I'm more worried about Hurricanes and Earthquakes than a bunch of guys in loin cloths drawing on stones. To me it is sort of like worrying about Zeus or dragons. Ancient people had little knowledge and a whole lot of time to kill.
 
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