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Numerical investigation of auroral cyclotron maser processes : publisher's note

Speirs, D. C. and Ronald, K. and McConville, S. L. and Gillespie, K. M. and Phelps, A. D. R. and Cross, A. W. and Bingham, R. and Robertson, C. W. and Whyte, C. G. and He, W. and Vorgul, I. and Cairns, R. A. and Kellett, B. J. (2010) Numerical investigation of auroral cyclotron maser processes : publisher's note. Physics of Plasmas, 17 (6). ISSN 1070-664X

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Abstract

When a mainly rectilinear electron beam is subject to significant magnetic compression, conservation of magnetic moment results in the formation of a horseshoe shaped velocity distribution. It has been shown that such a distribution is unstable to cyclotron emission and may be responsible for the generation of auroral kilometric radiation—an intense rf emission sourced at high altitudes in the terrestrial auroral magnetosphere. Particle-in-cell code simulations have been undertaken to investigate the dynamics of the cyclotron emission process in the absence of cavity boundaries with particular consideration of the spatial growth rate, spectral output and rf conversion efficiency. Computations reveal that a well-defined cyclotron emission process occurs albeit with a low spatial growth rate compared with waveguide bounded simulations. The rf output is near perpendicular to the electron beam with a slight backward-wave character reflected in the spectral output with a well defined peak at 2.68 GHz, just below the relativistic electron cyclotron frequency. The corresponding rf conversion efficiency of 1.1% is comparable to waveguide bounded simulations and consistent with the predictions of kinetic theory that suggest efficient, spectrally well defined emission can be obtained from an electron horseshoe distribution in the absence of radiation boundaries. © 2010 American Institute of Physics.

Item type: Article
ID code: 40939
Keywords: numerical investigation, auroral cyclotron maser processes, magnetic compression, auroral kilometric radiation, Physics, Plasma physics. Ionized gases, Probabilities. Mathematical statistics, Condensed Matter Physics
Subjects: Science > Physics
Science > Physics > Plasma physics. Ionized gases
Science > Mathematics > Probabilities. Mathematical statistics
Department: Faculty of Science > Physics
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 21 Aug 2012 15:48
Last modified: 27 Mar 2014 09:21
URI: http://strathprints.strath.ac.uk/id/eprint/40939

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