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Cyclotron maser emission : Stars, planets, and laboratory

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Date
05/2011
Author
Vorgul, I.
Kellett, B. J.
Cairns, R Alan
Bingham, Robert
Ronald, K.
Speirs, D.C.
McConville, S. L.
Gillespie, K. M.
Phelps, A. D. R.
Funder
EPSRC
EPSRC
Grant ID
EP/G042500/1
EP/D037093/1
Keywords
Electron beams
Auroral phenomena
Magnetic fields
Cyclotron resonances
Plasma instabilities
Plasma waves
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Abstract
This paper is a review of results by the group over the past decade on auroral kilometric radiation and similar cyclotron emissions from stars and planets. These emissions are often attributed to a horseshoe or crescent shaped momentum distribution of energetic electrons moving into the convergent magnetic field which exists around polar regions of dipole-type stars and planets. We have established a laboratory-based facility that has verified many of the details of our original theoretical description and agrees well with numerical simulations. The experiment has demonstrated that the horseshoe distribution does indeed produce cyclotron emission at a frequency just below the local cyclotron frequency, with polarization close to X-mode and propagating nearly perpendicularly to the beam motion. We discuss recent developments in the theory and simulation of the instability including addressing a radiation escape problem and the effect of competing instabilities, relating these to the laboratory, space, and astrophysical observations.
Citation
Vorgul , I , Kellett , B J , Cairns , R A , Bingham , R , Ronald , K , Speirs , D C , McConville , S L , Gillespie , K M & Phelps , A D R 2011 , ' Cyclotron maser emission : Stars, planets, and laboratory ' , Physics of Plasmas , vol. 18 , no. 5 , 056501 . https://doi.org/10.1063/1.3567420
Publication
Physics of Plasmas
Status
Peer reviewed
DOI
https://doi.org/10.1063/1.3567420
ISSN
1070-664X
Type
Journal article
Rights
Copyright 2011, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas, Vol 18, Issue 5, and may be found at: http://scitation.aip.org/content/aip/journal/pop/18/5/10.1063/1.3567420
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4334

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