EMP is not that successful a weapon. You’d have to detonate a fairly high power bomb hundreds of kilometers above the surface to cover the continent. If you have that powerful a bomb, you might as well drop it on New York or Washington. The Air Force and Navy know how to secure gear against EMP, and we’d have lots of warning.
As I wrote on this thread:
Try this and the links therein.
From this thread.
Read this and associated links.
All you need is a small fission device: it is the gamma ray flux which causes Compton scattering (electrons knocked out of the atoms / molecules in the upper atmosphere) which travel at relativistic speeds, and interact with the Earth's magnetic field.
The design of the bomb, and the casing, can enhance the proportion of the weapon's energy which is released as gamma radiation: and by designing the case properly one can focus the gamma rays "downward" to the ground.
A fission weapon, according to these sources, will still be quite a good source of EMP: it is not directly a function of notional yield.
10 Iranian Missile Engineers Visited N. Korea:Sankei reports(check on NK’s Chinese equipments)
S. Korea, U.S. verifying reports on test of new N.K. missile in Iran: source
(4,000 kilometer rangewill reach the VaticanMay 16th, 2007)
US confirms Iran launch of first home-built satellite
afp ^ | 2-03-09 | staff
Iran Satellite Launch Heightens Missile Development Concerns
By Donna Miles
American Forces Press Service
WASHINGTON, Feb. 3, 2009
Iran hails successful launch of satellite rocket
Posted on Wed 03 Feb 2010 02:51:50 AM MST