ELF-VLF Radio Wave Propagation: Proceedings of the NATO by J.A. Holtet

By J.A. Holtet

This quantity is predicated on lectures and discussions offered at a NATO complex research Institute on ELF and VLF Radio Wave Propagation, which was once held in Norway April 1974. The learn of propagation of electromagnetic waves with frequen­ cies less than a hundred kHz has lengthy traditions in ionospheric physics. To-day, this frequency diversity remains to be of serious significance, either to the physicist, who makes use of the waves as diagnostic instruments to check the earth's setting and to the engineer who exploits the characteris­ tics of those waves to enhance communications, navigation and timing platforms. in recent times the lively curiosity within the box has resulted in very quick development within the improvement of propagation conception in addition to within the software of this idea to the answer of sensible difficulties. The purpose of the Organizing Committee for this convention was once to collect theoreticians and experi­ mentalists engaged on many of the points of wave propagation, so as to stimulate a fruitful dialogue and trade of rules.

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Extra info for ELF-VLF Radio Wave Propagation: Proceedings of the NATO Advanced Study Institute held at Spåtind, Norway, April 17–27, 1974 (Nato Science Series C:)

Sample text

The approximate locations of the sources within +25 0 of the ecliptic, transformed into ecliptic coordinates, are shown on Figure 7 (Wende, personal communication 1973). The most intense sources are located near the galactic center. The sun progresses along the ecliptic equator at the rate of lO/day, so that some of the sources will be obscured for part of the time. The months indicated below the horizontal axis in Figure 7 denote the time of year when the X-ray sources at the corresponding longitude are near the nighttime zenith and could possibly contribute to the ionization in the night ionosphere.

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