Electromagnetic Pulse (HEMP)
EMP stands for electromagnetic pulse
which is a field of intense energy (CRS Report for Congress). Because
by line of sight, when an explosive device creates an EMP shockwave,
that can 'see' the explosion is susceptible. EMP is basically an
blanket of lightning. A blanket of lightning that will typically fry
of modern circuitry or damage anything that is wired (atomic archive).
scare for United States security is if one of these devices were to
a high altitude, giving the name HEMP device (High-Altitude
Pulse). If a large enough weapon were to explode 500km above earth's
centered on the US, most of the 48 state's coveted electronic devices
infrastructures would be destroyed.