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Some measurements of aerial impedance in the ionosphere

Published online by Cambridge University Press:  14 August 2015

J. Hugill
J. Hugill*
Affiliation:
Radio Astronomy Group Cavendish Laboratory Cambridge, England, now at Central Radio Propagation Laboratory National Bureau of Standards, Boulder Laboratories Boulder, Colorado, U.S.A.

Abstract

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The admittance of a wire dipole of overall length 20 m was measured at a height of approximately 125 km in the night-time ionosphere. Measurements were obtained at 60 kHz and at a frequency swept over the range 1.4 MHz to 1.8 MHz so as to include the gyro frequency. The results are interpreted in terms of a theory due to Kaiser, and fair agreement is obtained. The electron density and collision frequency in the plasma surrounding the aerial are estimated.

On a mesuré l'impédance d'un dipóle filiforme de 20 mètres de longueur totale, à une hauteur de 125 km dans l'ionosphere de nuit. Ces mesures ont été faites а 60 kHz et à une fréquence variée entre 1,4 et 1,8 MHz et passant par la gyrofréquence. Les résultats obtenus sont interprétés à partir de la théorie de Kaiser et sont en bon accord avec cette théorie. On en déduit une estimation de la densité électronique et de la fréquence de collision.

Резюме

Резюме

Был измерен импеданц нитеобразного диполя общей длины 20 метров, на высоте 125 км в ионосфере, ночью. Эти измерения были сделаны в 60 кгц и в частоте изменявшейся между 1,4 и 1,8 Мгц, включая гирочастоту. Полученные результаты интерпретированы исходя из теории Кайзера и находятся в хорошем согласии с этой теорией. Отсюда выведена оценка электронной плотности и соударной частоты.

Type
Session VII. Radio Frequency Radiation
Information
Symposium - International Astronomical Union , Volume 23: Astronomical Observations from Space Vehicles , 1965 , pp. 345 - 352
Copyright
Copyright © CNRS 1965 

References

Bain, W. C., 1963, Aerials in ionosphere of zero conductivity, Proc. IEE, 110, 897.Google Scholar
Bramley, E. N., 1962, The impedance of a short cylindrical dipole in the ionosphere, Planetary Space Sci., 9, 454.CrossRefGoogle Scholar
Deschamps, G. A., 1962, Impedance of antenna in conducting medium, IRE Trans., AP-10, 648.Google Scholar
Haycock, O. C. and Baker, K. D., 1961, Measurement of aerial impedance in the ionosphere, Electronics, 34, 88.Google Scholar
Kaiser, T. P., 1962, The admittance of an electric dipole in a magnetoionic environment, Planetary Space Sci., 9, 639.CrossRefGoogle Scholar
King, R. and Blake, F. G., 1942, The self impedance of a symmetrical antenna, Proc. IRE, 30, 335.CrossRefGoogle Scholar
Mlodonsky, R. F. and Garriott, O. K., 1962, The VLF admittance of a dipole in the lower ionosphere, London Conference on the ionosphere, July 1962.Google Scholar