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Originally posted by Zachsfunk49
It has been around 23 to 24 hours since the last ridiculous rhetoric has been announced from NKorea. They have been ominously quiet today. Maybe they finally gave up?
Originally posted by Zaphod58
reply to post by Red Cloak
A barely successful launch does not give them the ability to "hit anywhere in the Northern Hemisphere". Whatever they put up there is useless because it's tumbling so badly.
It's also a long way from "We just detonated what may be a nuclear warhead" to "We're putting warheads on missiles and rockets."
Originally posted by Zaphod58
reply to post by Red Cloak
Wow. That incredibly well thought out, and cogent reply totally destroyed any logic, or evidence to the contrary. I'm impressed.
Since you're such an expert, tell me, when did North Korea develop and test at least a radar altimeter for the fusing system for a nuclear warhead? How about the navigation system? The heat shield for reentry? When did they miniaturize their warheads to fit onto a missile? How does one, not entirely successful test give them the ability to hit anywhere in the northern hemisphere? How do you reprogram a weapon that's tumbling, and has at best a few seconds of line of sight to the ground station at a time? Those are just a handful of the things they would have had to do, without anyone noticing them doing it, with the incredibly limited resources on hand.
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, and this radiation can affect systems on land, sea, and air. The first recorded EMP incident accompanied a high-altitude nuclear test over the South Pacific and resulted in power system failures as far away as Hawaii. A large device detonated at 400�500 km over Kansas would affect all of CONUS. The signal from such an event extends to the visual horizon as seen from the burst point.
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...
...HEMP can pose a serious threat to military systems when even a single high-altitude nuclear explosion occurs. In principle, even a new nuclear proliferator could execute such a strike. In practice, however, it seems unlikely that such a state would use one of its scarce warheads to inflict damage which must be considered secondary to the primary effects of blast, shock, and thermal pulse. Furthermore, a HEMP attack must use a relatively large warhead to be effective (perhaps on the order of one mega-ton), and new proliferators are unlikely to be able to construct such a device, much less make it small enough to be lofted to high altitude by a ballistic missile or space launcher.
Originally posted by maxij
I don't know much about nuclear weapons etc. But lets say that the NK launches their WMD.
How quickly would the US be able to track and destroy the incoming missile?
Since if it's fast and what not, wouldn't the weapon still cause a EMP if it's too close (shot down above US)edit on 2-4-2013 by maxij because: (no reason given)