DPRK EMP

[woodyz]

empcommission.org/docs/empc_exec_rpt.pdf

So how could North Korea pull off an EMP attack? A hydrogen bomb detonated at a high altitude would create an electromagnetic pulse that would knock out key infrastructure – namely prominent parts of the U.S. electrical grid..

“An EMP is similar to a lightning strike in some respects, but it acts over a wide area – hundreds of miles,” explained John Gilbert, retired Air Force colonel and senior science fellow with the Center for Arms Control and Nonproliferation in Washington, D.C. “There would be widespread and probably long-lasting power outages and wire-line telecommunications systems such as telephone and TV/internet cable would suffer serious damage.

Individual items such as cars and trucks could also be damaged or disabled and damage could occur to electronic devices in homes and businesses.”
An attack could cut power to health care facilities and cripple municipal facilities and utilities.

EMP Commission cautioned in 2008 that the largely digitized U.S. could be left black for up to a year as a result of an EMP disruption. They say that even the sensors and monitors that function to re-start electronics after a power outage would be wiped out.

empcommission.org/

empcommission.org/docs/A2473-EMP_Commission-7MB.pdf

[woodyz]

How to Make Your Own Faraday Cage at Home (Quick, Easy, Effective!)

Last updated on September 3, 2017 By Contributor

How to Make Your Own Faraday Cage at Home – Quick, Easy, Effective! by Dr. Arthur Bradley

www.thesurvivalistblog.net/build-your-own-faraday-cage-heres-how/

[Cwi555]

Whomever wrote that how to build pulled some of that out of their arse. There should be no holes; it should never be grounded; the material does in fact matter; and skin effect comments totally off base.

Skin effect; Fink, Donald G.; Beatty, H. Wayne, eds. (1978), Standard Handbook for Electrical Engineers (11th ed.)

In a good conductor, skin depth is proportional to square root of the resistivity. This means that better conductors have a reduced skin depth. The overall resistance of the better conductor remains lower even with the reduced skin depth. However the better conductor will show a higher ratio between its AC and DC resistance, when compared with a conductor of higher resistivity. For example, at 60 Hz, a 2000 MCM (1000 square millimetre) copper conductor has 23% more resistance than it does at DC. The same size conductor in aluminum has only 10% more resistance with 60 Hz AC than it does with DC.

[graf]

Remember microwaves will work as faraday cages

[Cwi555]

Sept 6, 2017 17:37:52 GMT -7 graf said:

Remember microwaves will work as faraday cages

Actually no they won't for E1. It is easily demonstrated why.

You'll need you and a friend, spouse, child or anyone else with another cell phone.
Prop up one of those phones where you can see it inside a microwave, call that phone with the second phone. You can take it further by using a tablet or other wifi device. Set it playing a video where it has to continue downloading. Press play just before you close the door.

I've read many places that made that claim. They are all wrong as can be demonstrated by anyone with the above.

[woodyz]

Actually it sounded wrong to me, but I was not smart enough on the subject to question it.

I hoped CWI would jump in and he did.

I know there are posts on here about the very subject, I just can not find them.

I was also hoping CWI would either reference the old posts or give us a "correct" lesson.

I think if we can do so easy enough, we might try and do something to save our communications gear from the sun and/or the DPRK.

[Cwi555]

If it were any other board, I'd sit back and say nothing. The amount of disinformation, wrong information, and outright BS on the subject is phenomenal.

People are writing books, web pages, blogs, opening youtube channels so forth, effectively trying to capitalize on what is colloquially known as doom porn. Every fallacy argument in the book is used to sell it as well.

99.5% of the arguments given are wrong. Most of which can be exemplified by simple test such as mentioned in this thread. Speaking of which, the microwave test also dispels the idea it's OK to have holes in it. A microwave is designed to contain the large wavelength (4.8-12.9" depending on the unit) of the microwaves magnetron.
Shorter wavelengths slip right through those tiny holes you see in the microwave door.

Then there is the idea of grounding. That would work right up until the E3/E3 heave component hit turning your box into an emitter frying what's inside.

That box has to be 100% contiguous metal. In order to avoid the risk of secondary induction, line the box with at least half an inch of polyethylene foam to keep your items from making contact with the box surface. Seal it up so that there is no gap in conduction. Place said box on a bench or other surface 'off' of the ground, not in it. What you have then is a floating ground, the thing that let's cars and planes have electrical systems without being ground.

I spent a large chunk of my own money and time researching and experimenting with that. I made that money back in spades designing and building shield rooms for critical electronics and things like MRI exam rooms. That's industry, pumping erroneous information trying to make money off of fear and ignorance when it could get someone dead or otherwise screwed over, that is just reprehensible in my book.

I'll go back to my corner and shut up now.

[olebama]

Thanks, CWI. I always wondered what kind/how much insulation to have. Please do not go to the corner and do not shut up.

[graf]

I have a military compass will it damage it putting in a faraday envelope

[Cwi555]

Sept 7, 2017 14:57:44 GMT -7 graf said:

I have a military compass will it damage it putting in a faraday envelope

A military lensatic compass doesn't really need protection. The standard they are required to meet assures it (MIL-PRF-10436N).

The manufacture of the magnet runs over the materials saturation point on the BH curve of the hysterisis loop. Those materials are deliberately selected for high retention and low coercivity.


The net result is it cannot change its magnetic orientation as its already been saturated to the limits of its ability to take a field.

The only thing that can change that is heating it beyond its curie point at which time it's magnetic orientation is lost. If that happens, you have bigger concerns given that's around 660° F for the iron nickel material they use.

[graf]

Sept 7, 2017 18:04:48 GMT -7 Cwi555 said:

Sept 7, 2017 14:57:44 GMT -7 graf said:

I have a military compass will it damage it putting in a faraday envelope

A military lensatic compass doesn't really need protection. The standard they are required to meet assures it (MIL-PRF-10436N).

The manufacture of the magnet runs over the materials saturation point on the BH curve of the hysterisis loop. Those materials are deliberately selected for high retention and low coercivity.


The net result is it cannot change its magnetic orientation as its already been saturated to the limits of its ability to take a field.

The only thing that can change that is heating it beyond its curie point at which time it's magnetic orientation is lost. If that happens, you have bigger concerns given that's around 660° F for the iron nickel material they use.

Thanks good to know

[olebama]

would disconnecting the power grid help protect it from an EMP? I always hear about all the transformers being destroyed in an EMP. Could you "throw a switch" at the power plants with 10 minutes warning (if we new a missle was on the way)? I know that wouldn't protect the plant itself, but how vunerable are the power plants?

[Cwi555]

Sept 9, 2017 16:55:59 GMT -7 olebama said:

would disconnecting the power grid help protect it from an EMP? I always hear about all the transformers being destroyed in an EMP. Could you "throw a switch" at the power plants with 10 minutes warning (if we new a missle was on the way)? I know that wouldn't protect the plant itself, but how vunerable are the power plants?

This is the part that is most misunderstood. The ground/geomagnetically induced current (GIC), created by the E3, E3 heave components of a HEMP/NEMP is the threat to the grid.

There are four primary components to a HEMP attack. E1, E2, E3, E3 heave.
E1-E2 are air/top down. Their primary cause is the radiation/gamma/Xray burst near the atmosphere. This saturates the atmosphere just below the burst with ionized particles which in turn give off a charge. E1 has the fastest rise time, with E2 being slower and with secondary affects thrown in. Wavelengths of the energy transmitted cover everything under the electromagnetic spectrum. This does attenuate relatively fast in accordance with the inverse square law.

E3-E3 heave components are ground up. Everyone pictures atmosphere down only, but that's not the case.

E3 is straight induction into the ground, E3 heave is called that as it heaves the Earth's magnetic field via the nuclear blast. The return snap from that causes issues at the poles and a much stronger induction under the blast location.

The resulting GIC is what damages the grid/pipeline infrastructure.

[olebama]

OOOOHHHH. Thank you. I thought it was top down.