Comparison of Some Common Electromagnetic Fields with HAARP

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This chart compares some common sources of electromagnetic radiation with the signals that will be transmitted from the HF Antenna system at HAARP. Each of the sources listed above is compared with respect to the maximum permitted safe level under ANSI/IEEE C95.1-1992 in milliwatts per square centimeter (mw/$cm2$) for the frequency range in which it operates.

For example, AM broadcast stations which carry news, music and talk shows, are permitted to radiate at a considerably higher level of field strength in their immediate vicinity because of the frequency range in which they operate. Any transmitter that operates in the High Frequency (HF) range, (such as the one at HAARP), is subject to stricter field strength limitations under the standard.

The field strength for HAARP is shown at the point of closest public access to the site (at the site entrance along the Tok cutoff highway) and is based on both computer predictions and on numerous measurements that have been made during all phases of the program beginning in December 1994 and continuing through Developmental Prototype testing in 1995 and 1996. It represents the greatest field strength level that the public could be exposed to under any condition. This level is approximately 10,000 times below the safe level defined by the standard.

The level of field at locations farther from the site than the site entrance will be much weaker than the chart shows. This is because electromagnetic fields decrease very rapidly as the distance to the transmitter increases (they decrease as the square of the distance).

Safety standards have been developed to provide guidelines for the design and construction of radio frequency transmitters. The Record of Decision for the Environmental Impact Study, issued in October 1993, binds HAARP to compliance with nationally adopted standards for electromagnetic safety. Under this requirement, the program must assure that all standards for EM safety are met not only for current standards but also for any and all future modifications to those standards.

HAARP Home Page-> http://w3.nrl.navy.mil/haarp.html