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Author Stenzel, R. L. ♦ Urrutia, J. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ AMPLITUDES ♦ ANTENNAS ♦ COMPARATIVE EVALUATIONS ♦ CYCLOTRON FREQUENCY ♦ CYCLOTRONS ♦ DIPOLE MOMENTS ♦ ELECTRIC DIPOLES ♦ ELECTRONS ♦ EXCITATION ♦ MAGNETIC FIELDS ♦ PLASMA ♦ WHISTLER INSTABILITY ♦ WHISTLERS
Abstract The excitation of low frequency whistler modes from different antennas has been investigated experimentally in a large laboratory plasma. One antenna consists of a linear electric dipole oriented across the uniform ambient magnetic field B{sub 0}. The other antenna is an elongated loop with dipole moment parallel to B{sub 0}. Both antennas are driven by the same rf generator which produces a rf burst well below the electron cyclotron frequency. The antenna currents as well as the wave magnetic fields from each antenna are measured. Both the antenna currents and the wave fields of the loop antenna exceed that of the electric dipole by two orders of magnitude. The conclusion is that loop antennas are far superior to dipole antennas for exciting large amplitude whistler modes, a result important for active wave experiments in space plasmas.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 8


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