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

D. C. Speirs, K. Ronald, S. L. McConville, K. M. Gillespie, A. D. R. Phelps, A. W. Cross, R. Bingham, C. W. Robertson, C. G. Whyte, W. He, I. Vorgul, R. A. Cairns, B. J. Kellett

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.
LanguageEnglish
Article number056501
Number of pages1
JournalPhysics of Plasmas
Volume17
Issue number6
DOIs
Publication statusPublished - 1 Jun 2010

Fingerprint

masers
cyclotrons
output
magnetic compression
electron beams
waveguides
backward waves
simulation
cyclotron frequency
radiation
high altitude
kinetic theory
magnetospheres
conservation
electrons
velocity distribution
magnetic moments
cavities
predictions

Keywords

  • numerical investigation
  • auroral cyclotron maser processes
  • magnetic compression
  • auroral kilometric radiation

Cite this

@article{efa063101d064a049cc0f0df296956fe,
title = "Numerical investigation of auroral cyclotron maser processes: publisher's note",
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. {\circledC} 2010 American Institute of Physics.",
keywords = "numerical investigation, auroral cyclotron maser processes, magnetic compression, auroral kilometric radiation",
author = "Speirs, {D. C.} and K. Ronald and McConville, {S. L.} and Gillespie, {K. M.} and Phelps, {A. D. R.} and Cross, {A. W.} and R. Bingham and Robertson, {C. W.} and Whyte, {C. G.} and W. He and I. Vorgul and Cairns, {R. A.} and Kellett, {B. J.}",
year = "2010",
month = "6",
day = "1",
doi = "10.1063/1.3445414",
language = "English",
volume = "17",
journal = "Physics of Plasmas",
issn = "1070-664X",
number = "6",

}

Numerical investigation of auroral cyclotron maser processes : publisher's note. / Speirs, D. C.; Ronald, K.; McConville, S. L.; Gillespie, K. M.; Phelps, A. D. R.; Cross, A. W.; Bingham, R.; Robertson, C. W.; Whyte, C. G.; He, W.; Vorgul, I.; Cairns, R. A.; Kellett, B. J.

In: Physics of Plasmas, Vol. 17, No. 6, 056501, 01.06.2010.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Numerical investigation of auroral cyclotron maser processes

T2 - Physics of Plasmas

AU - Speirs, D. C.

AU - Ronald, K.

AU - McConville, S. L.

AU - Gillespie, K. M.

AU - Phelps, A. D. R.

AU - Cross, A. W.

AU - Bingham, R.

AU - Robertson, C. W.

AU - Whyte, C. G.

AU - He, W.

AU - Vorgul, I.

AU - Cairns, R. A.

AU - Kellett, B. J.

PY - 2010/6/1

Y1 - 2010/6/1

N2 - 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.

AB - 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.

KW - numerical investigation

KW - auroral cyclotron maser processes

KW - magnetic compression

KW - auroral kilometric radiation

UR - http://www.scopus.com/inward/record.url?scp=77954092774&partnerID=8YFLogxK

U2 - 10.1063/1.3445414

DO - 10.1063/1.3445414

M3 - Article

VL - 17

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 6

M1 - 056501

ER -