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Whistler radiation in plasmas with cylindrical magnetic field irregularities

Published online by Cambridge University Press:  18 September 2009

C. KRAFFT  and
T. M. ZABORONKOVA
C. KRAFFT
Affiliation:
Laboratoire de Physique des Plasmas, Ecole Polytechnique and Paris South University, 91128 Palaiseau Cedex, France (catherine.krafft@lpp.polytechnique.fr)
T. M. ZABORONKOVA
Affiliation:
Department of Applied Physics, Technical University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia
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Abstract

The radiation of whistler waves by linear dipole sources immersed in magnetoplasmas with cylindrical magnetic field inhomogeneities are studied. Two types of irregularities are investigated: magnetic field enhancements and depletions. A theoretical analysis is developed for comparatively weak local perturbations of the ambient magnetic field. Results are provided by numerical calculations performed for physical conditions typical of laboratory experiments involving artificially created magnetic field irregularities. It is shown that plasma regions with locally enhanced (depleted) magnetic field intensities can increase (decrease) the amplitudes of whistler waves radiated by dipole sources, regardless of their orientation with respect to the ambient magnetic field. Results are relevant to space and laboratory experiments on very low-frequency wave radiation.

Type
Papers
Information
Journal of Plasma Physics , Volume 76 , Issue 2 , April 2010 , pp. 193 - 207
Copyright
Copyright © Cambridge University Press 2009

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