BS EN 61000-2-9:1996

1 Scope and object
2 Normative reference
3 General
4 Definitions
5 Description of HEMP environment, radiated
     parameters
5.1 High-altitude bursts
5.2 Spatial extent of HEMP on the earth's surface
5.3 HEMP time dependence
5.4 Magnetic field component
5.5 HEMP amplitude and energy fluence spectrum
5.6 Weighting of the early, intermediate and
     late-time HEMP
5.7 Reflection and transmission
Annex ZA (normative) Normative references to
international publications with their corresponding
European publications

This standard defines the electromagnetic pulse environments resulting from both high and low altitude nuclear explosions.

This section of IEC 1000-2 defines the high-altitude electromagnetic pulse (HEMP) environment that is one of the consequences of a high-altitude nuclear explosion.

Those dealing with this subject consider two cases:

• high-altitude nuclear explosions;

• low-altitude nuclear explosions.

For civil systems, the most important case is the high-altitude nuclear explosion. In this case, the other effects of the nuclear explosion: blast, ground shock, thermal and nuclear ionizing radiation are not present at the ground level. However the electromagnetic pulse associated with the explosion may cause disruption of, and damage to, communication, electronic and electric power systems thereby upsetting the stability of modern society.

The object of this standard is to establish a common reference for the HEMP environment in order to select realistic stresses to apply to victim equipment for evaluating their performance.