Electromagnetic

Electromagnetic Pulse (emp) in the National Security Context

A definition and brief description of Electromagnetic Pulse (emp) in relation to national security is as follows:Any nuclear explosion 25 miles (40 km) or higher above the ground produces a highaltitude electromagnetic pulse (HEMP), a short-lived, overlapping series of intense radio waves that blanket a large swath of ground. These radio waves can induce electrical currents in metallic objects and so cause damage to electrical and electronic equipment, including electrical power grids, telephone networks, radios, and computers.

Electromagnetic Spectrum in the National Security Context

A definition and brief description of Electromagnetic Spectrum in relation to national security is as follows:The complete range of electromagnetic waves on a continuous distribution from a very low range of frequencies and energy levels, with a correspondingly long wavelength, to a very high range of frequencies and energy levels, with a correspondingly short wavelength. Radio waves, visible light, and x rays are examples of electromagnetic waves at different frequencies. Every part of the electromagnetic spectrum is exploited for some form of military, security, or espionage activity; the entire spectrum is also key to science and industry.