EMP-Proof Communication Systems

Understanding EMP Threats to Communications

The morning of September 1, 1859, telegraph operators across North America and Europe arrived at work to find their equipment sparking and smoking. Some reported receiving electric shocks from their instruments. Papers caught fire. Yet bizarrely, even after disconnecting the batteries that powered the telegraph systems, messages continued to transmit across the wires as if by magic. What these operators experienced was the largest recorded geomagnetic storm in history—the Carrington Event—and it offers us a glimpse into what an electromagnetic pulse could do to our vastly more complex modern communication infrastructure.

An electromagnetic pulse (EMP) is a short burst of electromagnetic energy that can couple with and damage electronic systems. These pulses come in two primary forms, each with distinct characteristics and threat profiles. Natural EMPs originate from solar activity, specifically coronal mass ejections that hurl billions of tons of charged particles toward Earth. When these particles interact with our planet's magnetic field, they induce powerful electrical currents in long conductors like power lines, pipelines, and communication cables. Man-made EMPs result from nuclear detonations in the upper atmosphere. A high-altitude nuclear explosion generates three distinct pulse components: E1, a nearly instantaneous spike lasting nanoseconds that couples directly into electronic circuits; E2, an intermediate pulse similar to lightning; and E3, a slower pulse resembling natural geomagnetic storms that affects long-line infrastructure [1].