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Title: Comparison of electric dipole and magnetic loop antennas for exciting whistler modes

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.

Authors:
;  [1]
  1. Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547 (United States)
Publication Date:
OSTI Identifier:
22599888
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; ANTENNAS; COMPARATIVE EVALUATIONS; CYCLOTRON FREQUENCY; CYCLOTRONS; DIPOLE MOMENTS; ELECTRIC DIPOLES; ELECTRONS; EXCITATION; MAGNETIC FIELDS; PLASMA; WHISTLER INSTABILITY; WHISTLERS

Citation Formats

Stenzel, R. L., and Urrutia, J. M. Comparison of electric dipole and magnetic loop antennas for exciting whistler modes. United States: N. p., 2016. Web. doi:10.1063/1.4960666.
Stenzel, R. L., & Urrutia, J. M. Comparison of electric dipole and magnetic loop antennas for exciting whistler modes. United States. doi:10.1063/1.4960666.
Stenzel, R. L., and Urrutia, J. M. Mon . "Comparison of electric dipole and magnetic loop antennas for exciting whistler modes". United States. doi:10.1063/1.4960666.
@article{osti_22599888,
title = {Comparison of electric dipole and magnetic loop antennas for exciting whistler modes},
author = {Stenzel, R. L. and Urrutia, J. M.},
abstractNote = {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.},
doi = {10.1063/1.4960666},
journal = {Physics of Plasmas},
number = 8,
volume = 23,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}