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Antenna impedance in a plasma : problems relevant to radio astronomy measurements from space vehicles

Published online by Cambridge University Press:  14 August 2015

D. Walsh  and
F. T. Haddock
D. Walsh
Affiliation:
Radio Astronomy Observatory, University of Michigan, Ann Arbor, Michigan, U.S.A.
F. T. Haddock
Affiliation:
Radio Astronomy Observatory, University of Michigan, Ann Arbor, Michigan, U.S.A.

Abstract

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A critical review is given of the theory and experimental observations of antenna impedance behaviour in a plasma, as related to radio astronomy. The emphasis is on electrically small antennas. Three simplified cases of plasma are considered, namely, cold plasma without magnetic field, cold plasma with magnetic field and warm plasma without magnetic field. Newly reduced experimental results are reported for the case of cold plasma without magnetic field, showing detailed agreement with theory in the neighbourhood of a cutoff in the propagation of the extraordinary magnetoionic wave.

On présente une revue critique des théories et des observations du comportement d'une antenne dans un plasma qui sont importantes en radioastronomie. On insiste plus particulièrement sur les antennes électriquement courtes. On envisage 3 cas; plasma froid sans champ magnétique, plasma chaud avec champ magnétique et plasma chaud sans champ magnétique. On discute de nouveaux résultats sur le cas d'un plasma froid sans champ magnétique qui sont en bon accord, même dans les détails avec la théorie au voisinage du cutoff de la propagation de l'onde magnétoionique extraordinaire.

Резюме

Резюме

Представлен критический обзор теорий и наблюдений поведения антенны в плазме, которые имеют большое значение дия радиоастрономии. С особой настоятельностью — электрически коротких антенн. Рассмотрены 3 случая : холодная плазма без магнитного поля, холодная плазма с магнитным полем и горячая плазма без магнитного поля. Новые результаты, которые находятся в хорошем согласии даже в подробностях с теорией около порогового распространения необыкновенной магни- тоионной волны, обсуждены на случае холодной плазмы без магнитного поля.

Type
Session VII. Radio Frequency Radiation
Information
Symposium - International Astronomical Union , Volume 23: Astronomical Observations from Space Vehicles , 1965 , pp. 335 - 343
Copyright
Copyright © CNRS 1965 

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